SpellReminder was created because I always forgot to renew my Commanding Shout. Thus, the addon started as ShoutReminder. Since then the addon has developed more and more features and become a full reminder system for all classes.

SpellReminder uses no datafiles, all information is pulled directly from the game as and when you cast spells, this makes it "reasonably" future proof for new expansions and talent changes.

I've just released version 2 offering cleaner/faster bars and improved spell detection. It tracks every spell you cast, be it a hot, dot, buff or debuff. Anything that has a duration.

Whats different from all the other spell trackers?
1) It has no "data table", it automatically detects your spells as you cast them, adjusting its timers based on the spells you cast. This means future changes to spells do NOT REQUIRE AN UPDATE.
2) Its easy to configure. You can configure every spell independantly, specifying:
-- bar color
-- abbreviated name
-- when to "Emphasise"
-- what sound to play on expiring
-- enable/disable bars for specific spells.

You can split your focus + target buffs to different bar groups, but any buffs/debuffs you cast will split into a separate group. you can set each bar group to different scales and postions, you can independantly select which bar groups should emphasise and which shouldnt.

You can change bar height/width, fonts, font sizes, bar textures.

Timers are adjusted according to the ACTUAL time remaining, meaning diminishing returns are taken into consideration.

You can find more information (albeit out of date) here:
http://www.wowace.com/wiki/SpellReminder

and a forum for bugs, etc here:
http://www.wowace.com/forums/index.php?topic=8889.0

and a direct download to the latest version here:
http://files.wowace.com/SpellReminder/SpellReminder.zip