This is a simple one, but useful. In iTunes, simply add ".:." in front of the artists you access the most frequently. For example, "Wham!" becomes ".:. Wham!". This has the effect of pushing the so-marked artists to the front of alphabatized lists. This includes not only the artists list in iTunes, but also the list on your iPod (saves a lot of scrolling) and, if you have iTunes set that way, the order of artists in yout iTunes Music folder.