While travelling, I'm using an iPod Touch as my mobile computing device. The small screen and 'Thumb typing' argue for short and sweet posts ; )
Before creating new video content, I will typically search YouTube to see what is available and get ideas. Vimeo is another good resource. Podcasts were especially helpful to make video/audio accessible when dealing with slow modem connections. Like RSS it would let you know when something new was available - and it would download that file for you automatically (e.g. In the middle of the night) so that it would later 'be there for you' in the morning. It also provides a structure to the presentations (1st, 2nd, 3rd, etc.). With a CMS to organize, streaming video to make it easier to view video on a slower connection, I haven't used podcasting so much when teaching. Though enjoy podcasting to collect stories from good resources, already downloaded, and ready to port over to the iPod touch for later listening/watching.