User language
en-N This user has a native understanding of English.
es-2 Esta persona tiene un conocimiento intermedio del español.
eo-2 Ĉi tiu uzanto havas meznivelan scion de Esperanto.
pt-2 Este utilizador tem um nível médio de português.
ja-1 この利用者は初級日本語ができます。
sw-1 Mtumiaji huyu ni mwongeaji wa Kiswahili cha kiwango cha Msingi.
Users by language

I've been editing on Wikipedia English since September of '05, though I'm not a particularly active editor. Usually just a few grammar updates here and there. Particular subject matter interests are:

Private spaceflight
List of Oldest Living People
Lines of succession (monarchies, religious leaders, etc)
Country histories
Meta-wiki list of Wikipedias

I do some light editing on other language Wikipedias occasionally. Specifically Esperanto, Portuguese, and Spanish. I'm not fluent in any of those languages, but effective enough to recognize occasional typos and phrasing problems or add small additional notes. Esperanto is probably the one I'm most capable in. I also can comprehend some Japanese and Swahili, though my understanding is quite rudimentary in both.