Video search and identification tool VideoSurf has a new script for Greasemonkey users that lets you see VideoSurf-enhanced results on Google, Yahoo, and YouTube. If a result has been indexed by VideoSurf you'll see its timeline, along with links to each segment which skip you straight to that part of the video.
VideoSurf is advertising this as a way to see video results before you click on them, similar to some scripts and extensions that show you site thumbnails straight from search results or on-site links (like Snap). I found it to work particularly well on mainstream content, although videos that have not yet been processed by VideoSurf won't show up.
If you're a Greasemonkey user I'd say this is definitely worth a go. The same goes for any users who frequently click on videos in search results, only to be disappointed by what they end up being. VideoSurf's scene-by-scene analysis puts an end to any surprises.