I'm not sure where the most effective place to post recommendations is, but here are two I have:
1. If you currently click the "Search" or "Go" button without typing in a query, you get an ugly MySQL error. It ought to dump you into a generic "Search" page or something like that. I can see no advantage in giving the user a "badly formed search query" error. Surely this can't be too hard to change?
2. If you put in a Wiki URL without the /wiki/ you get an ugly Error 404 and then a 5 sec. redirect. (i.e. http://en.wikipedia.org/Albert_Einstein -> http://en.wikipedia.org/wiki/Albert_Einstein). Why? I see no reason why it shouldn't just automatically redirect, unless there is some tangible benefit for telling people that they left out the "wiki" (when it doesn't seem to affect anything). Is there anything else they could have possibly meant when typing in that query? Why chastise them if we can fairly guess their intention?
FF