So I read here that 10.5.2 has been released. Cool! Click the little Apple icon and select Software Updates. 350M+ download - just a few minutes of work on FIOS. Seemed to install smoothly, though it did require two reboots. The only immediate difference is that I have a Time Machine icon in my menu bar that I didn't before.
Another item I found interesting in my blog surfings was an update to Safari that is due soon. Crazy fast? Cool.