Dexclock!

Free Desktop Clock is the advanced replacement for standard Windows tray clock. See the time, day, and date in different skins. Over 50 skins are included in the distribution.

Often you don't need the exact time in hours, minutes and seconds. A more human readable style like "five past ten" makes more sense. For that, you can now use FuzzyClock. FuzzyClock is a menubar clock which displays the current time in a "fuzzy" style.