I've updated my perl module for INGDirect (US only) to work with their new authentication system. It seemed like a good time to try to get it listed on CPAN, which turns out to be a rather involved process. I imagine that's a good thing, as it probably keeps the quality up. Anyway, in the meantime, you can download Finance::Bank::US::INGDirect here. There's a test script in the documentation that you should get you started.
Part of what prompted this is the fact that ING started blocking Mint.com. Shame on you, ING. Why don't you want me to be able to keep track of my finances in the way I choose?
I've also got a module for Busey Bank, which Peter Folk helped out with. If there's any interest, I can upload that, too.