Contributions

full-time Ubuntu advocate
participating in team discussions on a nearly-regular basis
handing out Ubuntu CDs mostly to those who could reach back for minor support issues
Being a volunteer at the Tech Museum, I've been providing CDs and support to my contacts there. Because of those, many people are now aware of "this really cool thing called Ubuntu".
convinced at least half of my colleagues at my workplace to switch from Windows and Fedora to Ubuntu
presented at team's Ubuntu session at SV Code Camp 2010
gave out a decent number of Karmic CDs at CLS-West (Jan '10)
actively participated in OSCON '09 planning and was a part of SCaLE '10 discussions
manned the Ubuntu CA expo booth during OSCON '09
supported users on IRC (#ubuntu primarily) for several months during 2009