Pinboard provides a stripped-down bookmarking service that it bills as “Social bookmarking for introverts”. You can import your Delicious bookmarks, and their API is modeled on v1 of the del.icio.us API, which should allow third party tools for Delicious to be modified to work with Pinboard.
There really isn’t much to say about Pinboard – it just works. If, like me, you use Delicious mainly for private bookmarks, Pinboard is a good replacement. However, if the social aspect of Delicious is what you love, you’ll probably want to check out one of the other alternatives (although I expect Pinboard will improve in this area due to the recent influx of Delicious users).
To get a Pinboard account, you will have to pay a one-time sign up fee (current $9.12) which they will refund if you cancel within 3 days. http://pinboard.in/upgrade. This fee may be the biggest downside to pinboard since other services (like Diigo) provide much of the same functionality with their free accounts.
I have paid my fee and will be keeping my account. Social bookmarking for introverts sounds about right to me.
Impressions of Diigo
Impressions of Evernote