Two different times in the recent past I have needed to recover a deleted or modified blog post. These weren't my own blog posts, of course, as those can usually be recovered or restored internally . These were posts on OTHER blogs or websites that had been taken down for one reason or another, but were needed for documentation.
Depending on the site's page rank, and how often the search engines update their cache for that particular website (more popular sites tend to be updated more frequently), a cached page can remain on the search engine for days or weeks. A cached page is a "copy" of a page that has been deleted or modified blog post.
You can search for a cached copy of a web page or blog post by entering as much of the title as you can remember as a search term, then clicking on "cached," (in Google and Yahoo) or "cached page," (in Bing). Above is an example in Bing. Although I use Google as a first resource for many searches these days, I have actually found Bing to be more helpful in recovering cached pages, so remember to check both, if you're looking for something important.
Also see: What happens online stays online. and Show me the cache. and Law.com: 'Cached' pages may be Evidence...
Jennifer Pointer (e-mail) is in Tulsa, OK. She promotes a simple, a low-tech approach to effective online profile management, search engine optimization and social networking.