I just bought my licence of TextMate on last monday.

I use it basically for ruby and rails stuff. But I've discovered a lot more for or html and xml for instance. I god rid of Taco. It's also great for editing shell script and python non mentioning the others...

The learning curve is really shallow. I soon started using it, I felt comfortable. I never liked BBEdit even if I gave it a fair try and even if it has great features.

I got through the help file which is good starting point to figure out the full capability of this baby. Definetly worth the read !