I came across these a little while ago:
http://www.youtube.com/watch?v=gZNm7L96pfY&fmt=18"
(I know that Fourier series and the transform itself aren't the same thing, but I thought you might still like the videos)
Yeah, I like to think of it as the same kind of comparison as *nix vs. Windows: bigger learning curve and bigger payoff vs. easy to use and quick to learn.
The TI-89 (Ti) came out in 2004, and the HP-50g came out in 2006, I think. Both are incremental upgrades to previous models, so I don't know if you want to consider these two as being completely new. Texas Instruments has already come out with what you might consider a new model, the...
Push and hold down the RSHIFT key (the orange one), then press enter. You should see the tilde (~) turn into an equals mark (=). This will make it so that all of your future entries will be displayed in symbolic form.