animation library, spline, spring, keyframe tool

[toglia]

Hi, I was wondering how do you guys do sprite animations? I want to start doing cool ui/sprite animations, with a keyframe system in which I can create custom interpolations, something like adobe flash. I imagine this is a need of many games, so which tools do you guys use to do this? Ive heard people doing custom tools with a xml file system accelerated with the gpu. What do you guys think?

[toglia]

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[Sigvatr]

In my game, which is 2d, I actually use 3d models which are always displayed from the same perspective, so you can't really tell they are 3d.

[toglia]

Ok, but I was looking for something like the keyframe tool of flash.
Say you wanted to do a " you win" text animation, normally in almost every game I know a cool text comes in, in a very dynamic way, changing its scale, opacity and moving. In flash I would normally do a keyframe of a small invisible sprite off the screen, move it to the position I want, and tell flash how do I want to do the interpolation, linear, smooth etc...
I'm finding myself doing animations by code which is not the most artistic way. I know this maybe is not called sprite animation but I don't know how to call that.
Doing one text animation, doesn't look hard enough, but when trying to do complex stuff with lots of moving things a tool like this is almost mandatory, or not?