I noticed the speeches from the Democratic and Republican conventions are available on the iTunes Store.

Click on the Democratic icon and you get a nice list of "selected" speeches. They're all available in audio, and the major ones in full video. You can double-click any speech to start it playing immediately. If you want to put the speeches on your iPod, you can either download them individually or download the entire collection by subscribing to a single podcast.

By contrast, to watch or listen to the Republican speeches you have to first subscribe to one or more podcasts. This strikes me as a gratuitous extra step, especially annoying since you can't start playing a given speech until it downloads completely. Offhand it sounds like the audio quality is poor compared to the Democratic audio. On the other hand, the Republicans provide a larger number of speeches.