By far the best tool for IM in a cost per value sense.
You can use it for so much it's terryfying.
Here's a new thing I started a few weeks ago.
I am creating sign ups for footprints scrapebox finds using Magic submitter.
I first find a profile/footprint - forum, blog whatever. Scrapebox sniffs a few thousand of them. I spend an hour programming magic submitter to do one for me - it copies the procedure to the rest. Prepare content. Press go. Done
I have a few thousand more sites to submit to automatically. Sign up, confirmation, submit etc. Would be a pain in the ass without scrapebox.
The commenting tool is awesome, but just finding open blogs and forums for you that you can limpet to for PR8 and PR9 links is great.
Then there's pinging, page view increases, competitor link finding.
How about mass commenting to your own blogs?
Whatever other tool I get, I always realize pretty quick that scrapebox complements it in some way.
Not only that, it's pretty darn solid. Only ever had one crash (and that was during an overnight 500 slow post session - it did almost 300)
Add captcha solving service to it, and for the money it beats all.
Some stuff is a little more sophisticated - but costs a lot more.
For the low one off price, no other link tool comes close for value. (not close...)
FOr me MNF is the equivalent value for keywords - but that's just me.
Scritty