When Karmic (Ubuntu 9.10) came out I installed it as my main OS, due to solvable but time eating problems I decided to go back to Windows 7. The biggest problem I had was with Adobe Flash.
A while back I decided to create a MMORPG (Massive Multiplayer Online Role Playing Game). It was created in PHP with MySQL database. The idea was to create something that would run in any browser without need of any extra plugins/addons.
I have been thinking about learning RegEx. It seems like you can cut down coding with the use of RedEx, i.e. extracting data from a string, replace data from string.