I'll get right into it. If you find your site's been de-indexed, submit a page/post other than your home page to at least 20 bookmarking sites. that's it. simple. I personally submit it to about 35 with only 10 of them being ********, remember it's not about the link juice, it's about getting your site back into ranking. Here and then a new autoblog would get de-indexed, all i do now is choose any random post and with social marker, submit them to about 30 bookmarking sites, it wouldn't take me more than 10 minutes. The next day, my submitted post and the homepage as well as a few other posts would be indexed. I've done this with 3 autoblogs and yesterday with a whitehat site that got googleslapted... today, Indexed! Hope this helps!