I posted this earlier in a thread in the Off Topic forum. Figured it would be useful to repost in a more appropriate forum.

It's not the perfect solution but it's much better than nothing.

Go to google.com, click Advanced Search, enter treocentral.com in the Domain field, then enter your search words.

On the results page, click the "Cached" link that appears at the bottom of each results.

To find an exact page within a thread:
in the "with the exact phrase" field, enter "page=x" where you replace x by the page number. For example, if you enter "page=1", the search is now limited to only the first pages of all cached TreoCentral threads.