My present favourite program I like to use is Open-Sankore, which attempts to be a blend between powerpoint, and interactive whiteboard software as well as a web browser/presenter, among other nice features. It isn't the most stable software to date, but it is definitely useful. The windows version has a podcast recording aspect that is helpful (with some limitations that occasionally has me going back to camstudio - another nice free project) but the linux version does not include any screencast.
This does a really nice job even on a slower machine, except the recordings use the
OGG format providing a video with an .ogv
JOEY-ELIJAH SNEDDON posted this guide from
HERE which I found quite helpful.