Cyanogenmod Infuse 4G (Unofficial rom build)
[ROM][2.3.7]Compiled CM7 for Infuse - Updated 1/12/2012.
Some developers over at XDA have been working on porting Cyanogenmod 7 to the Samsung Infuse 4G. While there is not yet an official Cyanogenmod release, there is a working rom available at the link above. While I would have preferred to wait until the Infuse code is added to the official Galaxy S branch to set this up on my phone, the recent CarrierIQ news gave me sufficient motivation to go ahead with this rom.
The instructions in the linked thread have everything you need, including instructions on how to root. I used a different method to root my device when I first got it (installing a different kernel using Odin), which actually caused me a bit of trouble; after rooting I had reinstalled the stock kernel, which bootlocked my phone. It took me a while to realise this was the problem, but once I did I just reinstalled the community kernel and everything went smoothly from there.
So far my experience with this rom is quite good. I have found that Swype has been a bit crashy, so I've had to reinstall it a couple times, but other than that have experienced no bugs.
EDIT: The link was to a thread that was no longer being updated, so I changed it to an active one.