I'm looking for a nice tool to make short screencasts, for showing interactions on websites, for example. Any good ones you know of?
This one is very decent, thanks!
+1 for quickcast. It's been fantastic so far and there are more improvements on the horizon
I just use Quicktime and then share it via Dropbox or my own server.
A lot of people don't realize that Quicktime has screen recording features built in. It's really great and easy.
If you need a lightweight video converter to drop file size or change to mp4 (so anyone on windows can easily watch it with their default player) I recommend Miro Video Converter : http://www.mirovideoconverter.com/
This is what I also use for converting to HTML5 video formats. Super lightweight. Super awesome.
Screenflow is absolutely the best for this!
It costs a bit of money, but I'm a huge fan of Screenflow for Mac. The editor is pretty powerful as well. I use it to edit my Signal Tower interviews.
Screeny seems decent, too.
I use Screenflick ($29, http://www.araelium.com/screenflick) and share the videos via Dropbox.
YMMV, but I found sharing via Dropbox to be way smoother than YouTube. Files convert quickly, and there is no unnecessary social stuff.
I tried this, but the quality is horrible.