Tons of great websites for learning Linux....... Techimo is one of the best.
http://www.LinuxQuestions.org (largest linux forum i know of)
http://www.LinuxJunior.org (home of the famous PET's)
http://www.USALUG.org (personal favorite

LOL ~ I wonder why.)
http://www.linux.com
Mandrake's own forums
Google is your friend
Best apps?? What do you want to do?
USA Linux Users Group's --- list of win/linux app conversion to help you out:
http://www.usalug.org/phpBB2/viewtopic.php?t=37
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Office Suites:
Windows software: Office, Corel Office, 9Software, Lotus SmartSuite
Linux software: OpenOffice, Star Office, Anywhere Office (formerly known as Applixware), Hancom Office.
Web Browsers:
Windows software: Internet Explorer, Opera, Netscape
Linux software: Konqueror, Opera, Netscape, Mozilla, Firebird (formerly known as Phoenix), Galeon.
Email Clients:
Windows software: Outlook & Outlook Express, Exchange, Pegasus
Linux software: Kmail, Thunderbird (formerly known as Mozilla Mail), Sylpheed, Evolution
Text Editors:
Windows software: Notepad, Wordpad, Write
Linux software: Kedit (builtin toKDE), Kate (formerly known as Kwrite), Gedit, KhexEdit, Emacs, the tiny little vi, YuDit
HTML/Text editors:
Windows software: Note Tab Pro, other editors
Linux software: BlueFish,Quanta Plus,Nvu
Macintosh software: PageSpinner, BBEdit
Graphics Applications:
Graphics Programs Suites
Windows software: Photoshop, Paint shop pro,
Linux software: The Gimp,Blender, VIPS, CinePaint
Macintosh software: Photoshop, CorelPhoto
NOTE: The Gimp and Blender are also progressing into video editing and animation manipulation (respectively).
Paint programs
Windows software: Paint
Linux software: xpaint, Kpaint, Gnome Paint, Tux Paint
Color pickers:
Windows software: Colour Coder
Linux software: KcolorChooser & KcolorEdit
Icon editors:
Windows software: (need names here)
Linux software: Gnome Icon Editor, KiconEditor
Screen capture:
Windows software: print screen key, Print Screen 2001
Linux software: Ksnapshot
Image viewers:
Windows software: (need names here)
Linux software: Ksnapshot, ElectricEyes (now defunct), Gqview, Kuickshow, Kview, EyeOfGnome, XV, GwenView
Drawing software:
Windows software: (need names here)
Linux software: Sketch, Kontour
Vector Graphics:
Windows software: Adobe Illustrator
Linux software:Gestalter
,Inkscape,SodiPodi
Macintosh software: Adobe Illustrator
Diagramming software
Windows software: Visio
Linux software

ia
Macintosh software:
CADD software:
Windows software: (need names here, AutoCad is not a match, is Visio?)
Linux software: Qcad
Desktop Publishing:
Windows software: Pagemaker
Linux software: LaTeX, Scribus
Macintosh software: QuarkXPress, PageMaker, InDesign
Sound/Audio applications:
Audio Players:
Windows software: Music Match, WinAmp
Linux software: XMMS, NoAtun, mplayer , rhythmbox
MIDI Players:
Windows software: (need names here)
Linux software: Kmid
MIDI Synthesis:
Windows software: (need names here)
Linux software: Kmidi, Rosegarden
Mixers:
Windows software: (need names here)
Linux software: Kmix, Aumix, Rexima, Xmix (now defunct)
Looping and composing apps:
Windows software: Cakewalk, Acid
Linux software: Audacity (not for the faint of heart!), Ardour, LAoE
CD Players:
Windows software: Windows Mediaplayer
Linux software: KsCd, NoAtun, XMMS, MPG321
MP3 Ripping:
Windows software: (need names here)
Linux software: Grip
MultiMedia applications (mpegs):
Windows software: Windows Mediaplayer, RealPlayer
Linux software: XMMS, Aktion (now embedded into KDE), Xine, Xmovie, mplayer ,Quicktime
CD Burning:
Wndows software: EZ CD Creator/DirectCD, Nero, B's recorder Gold, XP-Burn, EasyISO
Linux software: gcombust, Gnome Toaster, X-CD-ROAST , K3B
FTP applications:
Windows software: WsFtp, Cupertino, CuteFTP
Linux software: Gftp, Ncftp client (aka Ncftp), Lftp, Gnome Transfer Manager (aka Gtm), FTPCopy
Software development environments:
Windows software: Watcom C
Linux software: Glade, Idle, Kdevelop, Qt3Designer, Qt3Linguist
Camera software:
Windows software: (need names here)
Linux software: Gphoto
Photo Album software:
Windows software: EasyPhoto
Linux software: cthumb
Scanner applications:
Windows software: Caere, Omniscan, PrecisionScan
Linux software: Xsane, Kooka
Star chart/Planetarium software:
Windows software: SkyMap, CyberSky, Deep Space, Stellar Pro, My Stars, Home Planet , StarCalc , Distant Suns , Hnsky , Virtual sky, Alpha Centaure , Spica , Adastra , Nuit , Stellarium , Winstars , Starfinder , Skyorb , Stargaze ,
Linux software: Celestia, Kstars, Xephem, Hitchhiker 2000, OpenUniverse, Skymap (SETI-at-home), Starchart, xsky
Macintosh software: Astronomica, MacAstro, Planet C, Stargazer's Delight, Digital Universe, MacAstronomica, MPj Equinox, MPj Equinox, RedShift, SkyChart 2000, TheSky, Xephem