I just wonderd if you thought about bookmark integration?
Maybe with the help of Mozilla Weave? In that way people could easily synchronize them.
Mozilla Labs » Blog Archive » Introducing Weave

and by the way is there a way to integrated tabs with specific content?
For example a tab for my endnoteweb account or a tab for my evernote web account.
Or even better a frame with the option to run script from coscripter etc.