Inspired by Gabriel Weinberg's post about his history of side projects.
So, here is my list.
1999
My first webapp. I built this for my brother to catalog his closet
2005
A Firefox plugin that would let you highlight Chinese characters, right click it, and cross reference it with pin1yin1.com to get the phonetic notation of the character
2005-2006/2007
My first crowning achievement. One of my favorite projects. Built the first version on PHP, learned Porototype. Then a year later rewrote the whole thing in Ruby on Rails so I could learn it. Plots restaurants around Columbia on a Google map, with a bunch of different filtering options
2006
Muxtape before Muxtape came out. Basically a webapp that let you upload an mp3 playlist, and share it with friends
2007
Was really big into photography then and building stuff, so wrote a photoblogging platform in Ruby on Rails. It was used by no one besides me. Helped me learn RMagick
2008
Never made it to the public, but this project lets you email a link
to some email address, and it'll post it to your delicious bookmarks
I like to clip inspiring web designs, so I wrote a bookmarklet that would take a screenshot of the page your on and post it to Posterous
A webapp that allowed you to listen to podcasts via the web, instead of having to open iTunes or another media player
A Google App Engine project that makes Hacker News readable on the iPhone. Haven't really touched the code since 2008, and has the most traffic out of all of my websites
2008-2009
2009
2009-2010
2010