If you like to make DVDs, give iMovie 06 a try.
I use both iMovie 08 and iMovie 06, if I want to make a DVD I prefer iMovie 06. iMovie 08 is not as DVD friendly as iMovie 06.
iMovie 08 has replaced "Share to iDVD" with "Share to media browser". Also iMovie 08 cannot set chapter markers, this has to be done with another program.
When using iMovie 06, one mouse click will set a chapter marker EXACTLY where you specify. In just a few seconds set all your chapter markers. When you are done editing just "share to iDVD 08" and all of your chapter markers will be there!
iMovie 06 and iDVD 08 is a terrific combination.
Apple includes iMovie 06 as a free download to iLife 08 owners. (THEY WANT YOU TO HAVE IT!)
http://www.apple.com/support/downloads/imovieHD6.html
The Web site below has a good comparison of iMovie 08 and iMovie 06.
http://www.geethree.com/slick/imovie8.html