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That's probably another lesson I should add to the post: Never use 1and1 as your host.

Ouch.. it was looking good and I was considering it for my own startup thingie :)

Any good and cheap Microsoft hosting you can recommend? (as in the 5 to 10 dollar a month range)?

WP SuperCache?

I just got it installed and activated, and deactivated most plug-ins on the blog and website. Hopefully that will solve it.