Ubuntu user since the Hardy Heron. I run Ubuntu at home and at work: Ubuntu One synchronization reveals to be really useful in many cases.
I developed a modest app called Discvur (https://launchpad.net/~agmenor/+archive/discvur), to browse Imgur, a popular image sharing website. I am also eager to help the Ubuntu project more : with code but also by helping people on AskUbuntu (http://askubuntu.com/users/5592/agmenor).
I especially recommend those following programs : Firefox, Boinc, Minitube and the Ubuntu Software Center itself.