Yesterday i found this great way to store some imp bookmarks in your sidebar. And you can create different sidebar for each such collection. Like for my bookmarks click here.
Now you can save this bookmark (may be in bookmark toolbar folder) and use it.
So now you can point to any URL. and that URL will open in sidebar with given title.
atleast Works with Firefox
Update: Run google talk in firefox sidebar
You can click here: Add google chat to sidebar
A bookmarklet to bookmark websites to open in sidebar. click here
Also read : Webpages for Sidebar