While Googling around and forumming around you might notice that people use different Debian flavours, there are 3 different flavours right now – Etch, Sid and Lenny
Read it here
Debian Etch: Its the Official version also known as stable
Debian Sid: This is the unstable version. A version that will never be officially released. Its purely used for development work. Think off it as a Debian sandbox
Debian Lenny: The future Official version, the future stable. Its available for testing.
By all means, if you are a Debian n00b stick with Debian Etch. Dont worry about the the stable version being boring. For a n00b it is bleeding edge enough, I would know .