I'm 25 years old and I'm pretty much doing the same thing. Taking time off to work on my programming chops instead of jumping into another idea again as the "business guy". It sure beats spending six-figures getting an MBA or going to grad school these days... and I'm learning a ton. I'm absolutely loving it.

I learned Python first, then learned how to use linux and emacs, played with firefox add-ons to learn Javascript better, then started building web apps in PHP/MySQL, and now my plan is to spend my days learning and building stuff in Ruby and my nights working through these four books: http://stackoverflow.com/questions/414779/what-should-a-self...

Best resource ever is from @yegg, I always check this for guidance before learning anything new: http://www.gabrielweinberg.com/startupswiki/Ask_YC_Archive

I've come a long way since I first set up my server on Slicehost. Good luck on your journey too.