In Chrome, is there a way to search only within my bookmarked sites?

I just released a Google Chrome extension called SearchMark that will do exactly what you want. Hope you find it useful.

"It seems Google has a custom search you can point to your bookmarks file. From their doc, ""Here's a quick and easy way to create a search engine from the links on your web page"":
http://www.google.com/cse/tools/create_onthefly

The way I use it, I have to export my bookmarks from xbel to an .html file, but that's a useful thing to have anyway. (Especially since I haven't found a Chrome equivalent to Galeon's ""My Portal"")."

I think the only way to do this is to use the bookmark manager. You could make your own search engine just searching your bookmarked sites, but that's a little far fetched I guess. I guess the best way is to use the book manager by pressing shift+ctrl+b.

it looks like you CAN search for them but you have to use the dedicated searchbox for bookmarks in the manager http://www.google.com/support/chrome/bin/answer.py?answer=95714

This might not be actually a straight forward solution, but then you can use Historio.us. It's a social bookmarking tool that lets you search your bookmarks.