I am building a MacRuby app which will make navigating to your most common places on the web easier. What I don't like about the current "bookmarking" methods is that in order to get to, for instance, "http://stackoverflow.com", I have to first switch to my browser then click on the bookmark or type it in manually.

Also, your bookmarks aren't synced unless you're using something like Instapaper/Readability/Read It Later. In order to get to these bookmarks, you have to visit their site, login, and click on the link. Or, there's the Safari synced to iCloud method. But then you're tied to a certain browser

Furthermore, there's a fine line between an actual everyday bookmark and something I will "read later".

My app is a background app activated via some shortcut (e.g. Ctrl+Space), which allows users to see their bookmarks in a simple ui, then navigate to them via a number key. Up & Down switch contexts (school, work). Right & Left switch between bookmarks within a context (paginated)

I want this app to sync with some data source. My question is sort of architectural.

==MY QUESTION IS THIS==

Which service would you recommend to sync these bookmarks with? Dropbox synced to flat files in your "App" folder? Read It Later (but then your regular bookmarks get syncs with "read in the future" bookmarks)? Custom/proprietary database?

DISCLAIMER: I don't necessarily want advice on the UI (it's very alpha). I don't want to know about a better solution that already exists. I want your help building this, and I'd love to give some free copies away when I'm finished.