Some say they want to bookmark from within a window, like within an RSS Reader, with some solutions provided.
I’ve found the best solution for this is using the mouse right-click context menu, just hover over the hyperlink and right-click to add to del.icio.us.
Download it at Dan’s page, you’ll notice there are a few other goodies as well.
NOTE: Furl has one of these as well, browse around for it on their website.
[ADDED 29/01/07: The del.icio.us right-click doesn’t work within Google Reader as it opens in the same window, but the Furl right-click works because it opens a new window, so if someone out there can modify the del.icio.us right click so it opens in a new window that would be awesome.]