I've seen two tutorial archives making the rounds over the past couple days. Pixel2Life has wide range of tutorials on a number of programming languages and software. Oprah likes Tutorialized - and who's going to argue with Oprah? Both sites have been around for a while and include a large number of links. Good news: lots to choose from. Bad News: lots to filter through.
Many of the tutorials show their age, especially compared to recent "hip" tutorials like Why's Poignant Guide to Ruby and 24 Ways. Also, for most of these topics, you can find full books for free. Check out the list of Computer Science books at Textbook Revolution. Also, if you are looking to get started with AJAX or Ruby, start with these Top Ten lists (AJAX /