The motto of the AIW is conservata veritate, which translates to "with the preserved truth".
This motto reflects the inclusionist desire to change Wikipedia only when no knowledge would be lost as a result.
This user has been on Wikipedia for 18 years, 9 months and 27 days.
Angela Beesley - this was an interesting one, I accidentally got caught in some internal Wikipedia politics after voting and getting curious about why she resigned. Well, score one for persistence and a thick skin...
Computer science (and related articles) - I discovered this page with a weak summary and very little substantive content. I added substantial content and did a lot of mediation around the highly contentious summary. Eventually I managed to get the ball rolling on dispute resolution in part by forcing a 3RR and waving a flag at the mediation forces, before I took off for XMas 2005. Now it seems that things have been settled excellently by various people.