Yep,
I am a big Linux user. I have been a user for about 5 years now. I started as ost on Mandrake as it is the most newbie friendly. I now run Gentoo on my laptop. It is Dual boot with XP but that is only used by SWMBO and when I want to install software on my PDA.
Gentoo is probably one of the most technical of distros as you compile all software from source although this is easily managed through a tool called portage. It is also extremely easy to keep up to date. I run a single command which checks for any updates, downloads and installs them all without a reboot(Kernel excepted). It also means that all software is fully optimised for my particular computer.( It is optimised for the exact processor etc). Speed wise is superb.
As Roy has said, most windows programs don't work althogh some are available for both platforms(Firefox, Thunderbird and OPen Office being excellent examples) but you can usually find an alternative. e.g. The GIMP is a very good replacement for Paint Shop Pro, Evolution for Outlook, Gaim managed all Instant messenging protocols in a single program, XMMS even uses Winamp skins.
As far as reliability I had a server( an old P2 300 IBM box) which ran as a file/print server, Web Server, FTP server, P2P box. I had remote access through either SSH or Tight VNC. It was running for just short of 3 years without reboot before it had a hardware fault.
Which Live CD are you downloading? Probably the best is Knoppix. I have used it on numerous occasions to rescue broken Windows boxes.
I'm happy to help you if you have questions, my MSN user is
[email protected]( not used for email).
Ian