If you are using Camtasia (wonderful product) to create your screen captures and you do a lot of editing (especially zooms and call outs and cuts) you run the risk of overloading the project and causing Camtasia to slow and/or crash.
To avoid this, periodically grab a segment of your project and turn it into an AVI, cut that segment out and replace with the avi; then all the changes collapse into one as far as the project is concerned.
Pitfall #1: if your project is complex enough, you'll find that when you mark a selection and tell it to produce an AVI it does not capture the entire selection! And, worse, it doesn't tell you. So be sure to check that you (a) back up the project before making the avi and (b) check the avi. If this does happen the work around is to mark the selection, then choose "Crop to selection" (very scary!) which deletes the rest of your timeline. Then produce your avi. Then restore (ctrl-Z to undo) the cropping. Now you can delete the selection and replace with your avi. Sounds more complicated than it is, but make sure you are backing up and giving good names to your template files. I now have a directory structure that looks like this for each project
Pitfall #2: while you can edit the avi's you produce, each generation (each time you produce a video) creates some degradation in quality. Specifically if you make an AVI out of a camrec, and then edit that avi and make a 2nd generation avi which you then edit, and then make an avi out of the edited avi, pretty soon the sound quality is noticeably degraded.