This is a program I made to help with creating advanced animation timings for Minecraft 1.5+ texture packs.
I call it...

MCTextureTimer

Features:
Drag and drop frames to reorder them.
Change the timings on a single or multiple frames with ease.
Watch your animation as it would appear in the game.
Play/pause and seeking controls for fine-tuning your animation.
Save and load animation data to Minecraft readable .txt files.
Quickly write and test your animations using the built-in parser.
Change the background colors of the preview panes by clicking them.