Microsoft recently introduced a command-line tool that will take care of number 2. I don't recall what it is.
Microsoft, do you want to help out here?

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Greg Collins [InfoPath MVP]
Please visit: http://www.InfoPathDev.com
We have been using InfoPath forms published to the Microsoft bCentral hosted
WSS site. Last month we installed SBS 2003 and are currently implementing
Windows share Point Services locally.
Problem:
1. Every time we open up a new form for the library we get the message:
The form you are opening has the same form ID as a form already on your
computer=9D
2. We saved a lot of form from the hosted WSS site and then uploaded them to
our
new WSS site on the SBS 2003 server. Every time I try to open one of the forms
it opens it from the hosted site why?
Thanks for any help in this matter.