I mean: don't collect bookmarks in your browser.
Doing so means a browser synch tool, and they're mostly browser-specific and unwieldy, I find.
Instead, make most of your bookmarks public.
I use delicious. You add a link to your browser that takes you from any web page to a delicious page that adds the prior page to your delicious bookmarks.
You tag the pages with whatever's relevant for you or others--"learningtechnology," "instructionaldesign," "xml," the like.
Now you can find all your tagged pages anywhere you have a web connection.
AND anyone else can browse your tags or see those tags when tagging a page themselves.
Saving and sharing become the same thing.
Want students to collect and share bookmarks? Create a class account--it's free, and have everyone tag pages.
No more browser plug-ins or bookmark synching. No more sorting bookmarks into a tree structure. Just click, tag, be done.
Your bookmarks: anywhere.
(Yes, you can make private ones, too.)
--Edward R. O'Neill