I had the freej2me small clock but had to delete it because it didn't correctly calculate DST. I also tried the Sunclock which looked really cool, but didn't work with my Bold.
I just started working with the FREE subscription of WorldMate . It has bunches of features I might never use, but a bunch I will use all of the time including a world clock with a "daylight" map, and a currency converter which (so far) appears to be reasonably accurate as I'm not buying US$1 million lots anyway...