When you say tools, do you mean software, videos, books, etc...?
As far as books, one of the best books to read is called Kill Everyone. A lot of MTT talk and some great chapters on SNGs. Some advanced play in there, but one of the best reads out there, especially in regards to the chapter on bubble factors.
As far as software, other than SNG Wiz and HEM to review your games, there is not much out there. Overall, you still need to have a solid SNG game (tight early, pick up chips in middle game, have a solid push/fold game), but as compared to 9 mans, it is more imperative that you come in first in these MT SNGs, as the prize pool is heavily weighted to first place, rather than just making the money. So you are doing what you can to chip up throughout the tourney, then when we hit the final table, we can use SNG Wiz to help evaluate our play, especially as we are close to the bubble, but again, all with the understanding that you need to do your best to finish in the top spot.