Tapbots, one of the most consistently innovative user experience-oriented development houses on the iPhone platform, just let us know they've updated their latest app, Convertbot (see our review), to version 1.1.

Convertbot is for those who not only want to get things done, but who want to enjoy doing them. This update adds user-selectable enabling/disabling of categories/units as well as a TON (standard or metric! Convert to your choice!) of new categories/units and new currencies.

What's more, they've released Convertbot Mini as a Lite-as-in-FREE version of the app that gives you the same great UI, albeit without as many different units and categories (hey, it's free and the full version is a steal at the introductory price!)

Convertbot 1.1 ($0.99 - iTunes link) and Convertbot Mini (Free - iTunes link) are both available now.

Tapbot was kind enough to give us a sneak-peak at Convertbot, their latest app, which converts units of power, pressure, speed, temperature, time, volume, work, angle, area, currency, length, and mass with the same kind of fun, fantastic interface they brought to their previous app, Weightbot (see our interview).

Rotate the wheel, old-school iPod style, to pick your category, tap to lock in the first unit, confirm, tap to lock in the second unit, confirm that, and you're ready to go. (You can also tap the center button to change the direction of conversion at any time -- i.e., miles to km, km to miles).

Rather then the generic keypad, Convertbot drops down it's wheel to reveal a custom job, complete with backspace.

It's a simple application done with a lot of care and consideration. It's the kind of app we need more of. Full gallery after the break.

Convertbot is now available for $0.99 via the iTunes App Store.