Disclaimer -- As some of you may have noticed, I now write the Beating the System column for MacUser. I don't know what to disclaim, but since I'm identified as the editor of TidBITS at the end of those columns, it seems only right to mention it here. Writing for MacUser is different in that I have an approximately four month deadline for MacUser and a one hour deadline for TidBITS. That said, check it out and see what you think of my writing when I have a word limit and a professional editor.
iMovie '09: Speed Clips up to 2,000%
iMovie '09 brings back the capability to speed up or slow down clips, which went missing in iMovie '08. Select a clip and bring up the Clip Inspector by double-clicking the clip, clicking the Inspector button on the toolbar, or pressing the I key. Just as with its last appearance in iMovie HD 6, you can move a slider to make the video play back slower or faster (indicated by a turtle or hare icon).
You can also enter a value into the text field to the right of the slider, and this is where things get interesting. You're not limited to the tick mark values on the slider, so you can set the speed to be 118% of normal if you want. The field below that tells you the clip's changed duration.
But you can also exceed the boundaries of the speed slider. Enter any number between 5% and 2000%, then click Done.