Can't resize partition in Disk Utility (OS X 10.6.7)

For some reason resizing a partition fails with the error, "Partition Failed. Failed with error: Could not Modify partition map because filesystem verification failed." Any ideas? I was squeezing down an existing partition to make room for another and I'm stuck. I read where in OS X, "... this just works."
Screen Pic

Thanks, Jolly. I should've said that I'm already using an external USB startup system, with a known good OS X 10.6.7 OS version installed/updated to boot up with, not the drive being worked on. I don't think that I would've gotten to this point otherwise.
I found the answer, though, thanks to your implication/confirmation that it should work. Turns out, had to repair the partition, not the root drive. The root drive had given no errors, but the partition did give a couple when checked (who knows? Maybe Disk Util put them there...).
So after I fixed those and checked for no errors, then I was able to compress the existing filesystem and make a new partition for a new OS. Then I was able to boot back to the startup volume to do the install. I am going to try to use Server on this Mini. Is there anything I should look out for?

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