I've been using Mediawiki for a while now and found the Lucene search engine very good for searching pdf's (and other documents) uploaded to the Mediawiki.
I recently discovered Turnkey Linux and noticed how so much of the configuration is pre done for Mediawiki. So much so that I've transfered my company wiki over to it.
Unfortunately, ezmwlucene isn't that easy to get going, I never managed to get the script to stop and start in controlled way but I can get it going in an 'ad hoc' sort of way.
However, I think the search capability is of ezmwluce is better than the default search tools on Turnkey linux - not sure exactly what you're using 'cause it is better than the default Mediawiki search.
Anyway, given that your recent blog post called for improvements, I was wondering if you guys might considering putting your server config skills to the Mediawiki applicance and consider a way to intergrate this function.
Keep up the great work.