The most members online in one day was 606, 10-28-2009.
$HREDDER, 08 RINKER, 1BadStinger, 21ptl40, 24islander, 24OL4now, 266boat, 27Islander, 283Check, 28offshore, 29 Outlaw, 290 enticer, 290SEARAY, 2Ton, 32dom, 33webbcraft, 35fountain, 35ZR Donzi, 36Tango, 38fever, 38TG, 400SS, 410dancer, 4thegirls, 81 Scrambler, 93mariah, A$$ET$, ABT, alonzo111, alpine1945, armond, ASH, asi, augmon, Average Joe, awol, AZ2LOTO, B.Z., ba17a, baditude, Baja 252, Baja Tender, baja22, bajadog, bajaislanderII, Bajajack, BAJALOATTY, BajaLuvr, BajaOutlaw, bblythe, Bcallaway, BDiggity, bdold, beef2k, berniecig, bess, bgard510, bhawk, big e, Big Z, Biggus, Bigpat5123, bill78, BillfordWimley, bjcox579, bjjennings, black thunder 46, BlackRinker, BLAKEP7031, bleek, Blue Baja, bms26, boater2, boatguy94, BoatnFool, boost, BossHAM, Bottom Side Wet, bowhunter, boz251, Bradly, brettttka, brohrbach, Bryan B, bsloop, btaries, bustag, Butt Cheese, c-dub, cabin fever, caduceus88, Cairobaja, cajun, Caluw1, CAP, CaptainLoto, cari&ken, Carnivalride, CatDaddy, CharlesM, Chart, cherryCobalt272, Chris At Farmers, Chrome Lady, chromecat, CJmike, ckmansell, ckmate28, clydsdale77, cobalt, CobaltGuy, comp, conv73mustang, Cool Change, Cooperfly, Corndude, CoveHopper, CPR, creeves91, crownedatlast, crowniebr, CrownLS, crownmann225, csheldon, Cuttingedgemarine2, cuz553, cwzonk, cyb, Dan Ryan, danmuths51, Dante Pierangeli, dapperstu, derekpfeiffer, DeSimulacra, DIRTY DUCK, diverdwn, DL, dlange, dlewis1340, docjimm, Dockman, dond, Donzi Dude, Donzi4me, DOUBLESCORPIO, Dr. B, Drag7522, dragula, Dredd, drewplus2, DS01, dsingleton, dstroyed, Dtanman, duckcommander, duke, Dwayne, dwoutlaw, dykstra, ebwick, eddie, eeasy, eichhoma, eleganza, emilsr, Enough, eyesurf, faiskeoadave, Fastech, FasterThanYou, Fever, fgsacts, fire35hm, flogit06, FlyenBrian, flying33, Flynon H2O, fodshaker, fong, force220, formulafreak, fountainboy, Franky, Freeloader, fritz65, frogII, frygirl, FunHome, GCB, gcfire, gclapper, geppy97, ggspot, gh517, GINTONIC, GlassGuy, glenn at glencove, go chiefs, google_11, great white, GregTheKeg, Griff, H2OMAN, Hairrazor, hammer down, Harpers225, Hawkeye, hawki, Healey100m, Helmwurst, hersh, highlife, hiho, hitnbottom, hknipp, Holy Smokes, hotfordboat, HP500s, hp525efi, hughey, Hunterman, husgers, HUSKER DOUG, hydrostream, IBCAMN, infield, inknppr, inshuru, insureu2, irreng, ISAAC, J.T., Jay Bird, jcbpc, jcrubaugh, Jeff, jeffdh52, jeffswav, jfluhr18, Jkgstuff, jlschmitz, jmartin, jnm, joegsxr, joey, John P, jpfreak73, jr., jrncraft, justgolf5, JustUs, jwoutdrs, K-9, k-dog, kat daddy, kc0hlx, kchilewski, KCHOTBOAT, kentdg, Keytime, KiloKat, kmga1, knot fast, knox0083, kphayes, krakmeup, Kriceman, ksfuncpl, ksucat99, k_plaz, lake lizard, lakeproject, laker, lakerelax, laketime, lake_carl, lamar, later, Lawrence, let it loose, liesel, linhardt, LiquidLightning, Liquor Cruz, LisasSlave, little m, littleboss, Livin on the Edge Too, livinglife2, LOTOC Mike, louie, lswaterboy09, luvnlife275, mac, MackDad, mackie louise, Mad Max, MAKESMEHAPPY, Mark W. Hoeman, maverick21, MAX POWER, mbj359, MES, Metalhead, mfcoop, midmo3, MidMoTiger, midwest272, Mike288BR, MissLakeTime, mlev, momike, mosi, MovinFr8, mpally, MRBAJA, msboogieman, mstang73, MXBAJA421, My Corona, n9gtl, Nate, nebraskabaja, Need For Speed, Never Satisfied, neversatisfied, NOOKY, NORM, nosmoking, Notched Baja, oknozelman, OldCat, OLDDIRT, Onken23, ONTHEROXS, opqr192, orthos1, osageid, ottopedlr, Outlaw 25, Outlaw 29, outlaw95, outlawd25, ozark1, ozarkdevil, paradise found, PaulUptime, payton34, pearcedripples, Pit Boss, plan B, Playa_G at 4-Play Games, pops, portagebob, Potatoes, Powerquest1, Premiums, proam88, PromoProducts-BP, ptoon, Quicknloud, Quinny, rasttus, rattdog, rbcubic, realdeal211, REC SPEC, RedBaja, redbud35, redriver1, regalboater1, Reggie, Remshot, repeatoffender, rerun, rhunter113, ridin hood, riverboat, RiverRat21, RMDye, Rock Solid, Rockies Boater, rockstar38, Ron Everson, ROOSTER, RP MCMURPHY, RPM Marine, rtarnick, Rubber Duck, rummy, rweber81, Ryan, sandstormracing, Satisfied, saxman, sbledsoe, sc outlaw, scanner, Scarab3DMC, schnydo, sdw, Sea Esta, SeaLegs, seamutt, sean257, searay, seiowan, senglert, sfriesen, sh1100, Shakey, Shallow Minded, Shamu, shipshape, sikinboat, Silversailor, SixMM, slacker, sledhead29, sleekcraft_bmc, SLOWRIDE-388, smokenglide, smokey9015, snapperhead, snoop, SO'M BEACH, sofieo, Somewhere In the Sun, SoonerJake, Soul Asset, spk, Sport 280, srv220, ssamme, SST 23, Steve H, still smoking, stinger, stracysdt, strib21, Sunbum, Sunday Funday, Sunpointair, sunsport, superduty4bmf, surgeon50, SWANNY, Tbonepmp, teamscarab, Terri, TGI, th, the bear, The Filthy Oar, thumper59, time2kyl, Titan912S, TK, tko232, trace, Tragically Hip, treated, Tres, Trips2Win, trofie, Trojanman, tstrom, Ttowner, ttownmatt, twanger, twittybird, txdox21, ultrahd4me, us2onthewater, Von Bongo, w44, walleye4383, Warren Mullen, waterboy, waterdogs, waupachino, wdsm, weekend@burnies, weekender, wet pleasure, Wet Vett, wetdebt891, WhiskeyTangoFoxtrot, White Noise, who knows, wiggler4490, wildcatwilly, WOODSY, ya never know, yrkoski, Z272, Zack, zdatzkc, Zipp, Zombie, zoro

The most registrations in one day was 39, 12-21-2009.
BillfordWimley, duke, redriver1, txdox21

tomski (61), Gnarly Girl (58), ron hesse (58), Liquor Cruz (53), jwoutdrs (35), JB (34), Just Dreamin' (33), Hawk6969 (33), Roxi (26)