I was going to use a toy language

but I ended up doing http://anisearch.net/ in perl instead.

Also, using "quotes" to search for things breaks the ?q= page links at the bottom.

Searching for tags doesn't really work. Clicking on the tag "vip quality" gives me results for stuff tagged with "quality cabbage." It shouldn't.

Filtering "privileged account" results would also be a nice feature.