ConsoleBG (2.2) - Puts a configurable background behind the console to make it much easier to read the console text.

Recast (1.73) - Displays all of your Abilities and Spells recast timers if they are on cooldown, letting you know when they will be ready again.

ExpWatch (2.0) - Takes an average of your experience over 30 minutes, and calculates your xp/Hour & TTL (Time to Level).

G15Binder (1.2) - Maps G15 keys directly to ingame aliases.