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Is it simply a matter of linking to them from existing sites and / or getting listed in other indexes and / or directories?
[I have not had the opportunity to test the theory yet - about links - but wondered if anyone else had noticed symptomatic behaviour.]
You can also submit for MSN through Yahoo's free submit, but there you have to sign in with a username and after submitting one URL you'll be presented with a page describing their other paid services.
Still free, but they're both like a pre-sales warmup.