A 24 Hour Marathon of Camtasia Demos & Tips
Jing is great for quick & informal sharing of images and videos. However, TechSmith also offers Camtasia for Mac and Camtasia Studio for Windows. Camtasia packs in all kinds of recording, editing and producing powers.
If you're interested in learning more about Camtasia, one fun way might be to tune in to the "24 Screencasts in 24 hours". A bunch of different people from TechSmith share Camtasia insights, tricks, or instructions in an informal setting. We stream it live as well as archive all the recordings. Here's one we did for Snagit not too long ago.
You can see the topics and learn more over on Betsy's blog. She'll be pulling an all-nighter with a couple other people so who knows what you'll see around 4 am! Here's how to join in and info about some prizes we'll be giving away.
I'll be on at 6pm Tuesday and again at 7am on Wednesday. (Eastern Time...GMT -5:00)

I used Camtasia in my last job and it's a solid app,
Nice list of topics.
I shouldn't need an account or internet access to run it.
Can't use it because of my company firewall.
Will just torrent the full camtasia instead.