I've for a long time toyed with the idea of refreshing my wildly out-of-date programming skills (I was in the last class at school that did everything in PASCAL before they switched to C) to be able to try and build some of the iOS app ideas I've come up with over the years (I ran an iPhone App review podcast for a while and came up with a number of ideas of my own).
For anyone who's done it, what's the best (quick, effective, and inexpensive) way to learn a new programming language like the Objective C that iOS applications (and I believe Mac OS apps as well now) are written in? Thanks!