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(Note: Not really sure what kind of hack this is, or if it even is. Ultimately, it will become a forum migrator too, which I guess is a hack-tool-thing. ... sorta)
No, this isn't flawless, and no it doesn't move your posts (working on something like that), but if you are like me and had a site whose uses and functions exploded without warning (jumping from 200 views per day to 4,000+), you needed a way to get your data into a good CMS like Xoops.
I was running IPB 1.3, and needed to get my data into XOOPS as fast as possible, the most important data being my user database.
Nobody wants to re-register. So here it is, a user DB migration tool, hopefully the first of a few.
Note: things are hard coded, and I am not fond of the "exempt" users method, but I couldn't think of an easier way. If anyone has one, more power to you, and please post so we all can learn.

Without any more rambling, the code:
http://www.felocity.org/files/xoops_2.0.5.x/ipb1.3-users-to-xoops2.5.2.zipPlease let me know if there are any questions, etc. Good luck!
Quick note: This does NOT put the user into the registered users group. An Insert statement to drop the new UID into group 2 would be helpful, and once I finish on a few sites, I will come back and correct this.