Update: 4th October I've been seeing more people looking at how they can search for just Lost information so I though it was worth "bumping" this post back up after 2 years.
I've just updated the Search engine to include some newer Lost sites.
Search Option Link on the menu.
This search engine indexes ONLY Lost sites and can greatly help you find almost any information that you require. Give it a go :)
If you belong to other websites/forums, please can you ensure that these sites are aware of this search engine and submit their URL's to me so that I can include them. I've included the majority of the big ones, but if you find any missing please let me know.