Conclusion
Hopefully you've learned quite a bit about iMovie '08. As you can see, the program can be very involved, but it also has a quite a bit of functionality never before seen in an (relatively) inexpensive video editing software.
For a more in-depth reference, check out David Pogue's iMovie '08 & iDVD, The Missing Manual. It's an easy to read reference book and pretty darn entertaining – you know, for a manual.
Watch the Purple Heroes Movie:
