mighty and the most used shell because it is the most used shell ;-) if you are not depending on the 'feature' it's already everywhere installed (even OSX) have a look to zsh. before you start working on it read bash pitfalls- it will save you plenty of time and feelings of torture ;-)
The update for the bash bug is not coming down the line for petra do I need to upgrade to Qiana?
Like it said Awesome. I started off on UNix then moved to SUSE 6.1 and moved up to SUSE Professional 8.2 (prior to the take-over by Novell). In all that time I used mostly text commands. But when I switched to Ubuntu 6.6 it was fun to use the mouse too though Bash was quicker (like Liquor) ;)!