Lately I have done some backlink indexing using some of backlink indexing services available out there. Conclusions: Its not cheap, not all of the links get indexed (about 45% index rate) and I didn't see any significant movement in my SERPs. So what is your experience with backlink indexing and Is it really worth the money???
If the links come from blog comment spam and forum profiles where 100s, if not 1000s, of spambots already been posting, the boost would be very weak, if not non-existant. Quality manually generated backlinks are another thing. Just make sure the pages containing the backlinks are indexed in the search engines, you can speed up indexing by pinging.
I simply don't bother with worrying about when my backlinks will get indexed, if the backlink is going to have any effect on my rankings, then it'll get indexed sooner or later, no point in worrying about it.