I've been a Wikipedian since October 2003 and an administrator since February 2004 (when Wikipedia was much smaller than it is now), so I suppose I could be called one of the old-timers.
I edit a wide range of topics, but the ones I keep finding myself coming back to tend to be those relating to the Balkans, classical antiquity and contemporary politics. I also have an eye for the ridiculous, which you can see in some of the article's I've edited! I've also been involved over the years in developing various aspects of Wikipedia policy and guidelines; Wikipedia:Naming conflict is one of mine, for instance.
Articles which I've written over the last year and of which I'm particularly pleased include:
For your work on scientology and NPOV in passionate national disputes I Secretlondon am amazed that you've never previously been awarded a barnstar(KC)
ChrisO is hereby awarded this pile of Barnstars as late recognition for all his contributions, in the form of writing articles or otherwise, to Wikipedia.
For negotiating a ceasefire acceptable to both sides in the heated "Operation Medak Pocket" article. You really deserve this barnstar. From --P-Chan 00:21, 6 April 2006 (UTC) (KC)
The Oddball Barnstar
For all your efforts in restoring what is possibly WP's oddest article, Crushing by Elephant to its rightful status as Featured Article! Borisblue 22:26, 13 September 2006 (UTC)
The Barnstar of Diligence
For your superb achievement of converting the stub of Quneitra into a well-deserved featured article. –-Al Ameer son (talk) 04:43, 17 February 2008 (UTC)