I guess I should include the obligatory disclaimer. I love my iPad. It follows me everywhere I go. For most of my computing needs, it has replaced my MacBook. My life is run out of e-mail, 2Do, Dropbox, iBooks, Kindle and Instapaper.
Still, my iPad wouldn't suffice for my daily "work" computing needs. I'm a web developer, building Drupal & WordPress sites. For my work, the iPad is missing:
* MAMP
* Pixelmator, with a proper mouse for finer control
* A better WordPress app or let Safari upload files
* Safari's "Web Inspector", complete with Resources, Timeline, and console
* Something like Safari's "Live CSS Editor" extension
* A proper IDE. I've tried Nimbus and Gusto, and neither of 'em are that great, even with a bluetooth keyboard
In short, I need a "truck" (as Steve put it) parked in my garage to do my heavy lifting. I prefer driving the "Mini Cooper" for pretty much anything else.
Edit: I just came across Editor for iPad by YBOOM, which looks like it might be worth trying. Anyone with experience using it?