Haha, you should see my bookmarks... no less than 10,000 right now (probably more) and I export and clean them every 6 months. The thing is they are all quality sites or pages and interesting information that I would like to read or will need sometime soon. I've tried all of the major bookmarking sites and have even planned on rolling my own a couple of times (didn't have enough time to build it out though).
500 tabs is probably an exaggeration, but unless I recently restarted my computer or Chrome so it will update I always have over 100 open.
Does anyone know of an open-source bookmark manager that can be self-hosted? The bookmarklet is easy to create and archiving a copy of the site would be a really nice feature (but not required). There are also several scripts to pull out summaries or body text from pages, but those could always be processed later.
I'd like to eventually import all the bookmarks into some kind of bookmark manager once I figure out the best way to handle it. The XML files that Chrome creates when you export them are a very nice storage format for processing later.