I also am a huge pinboard fan, but not for things that I use daily. I use XMarks for all my main things, and pinboard to store things that I rarely use, or if I am going to need a list- for instance, one of my physics professors wanted a list of web sources to save him some time (60 term papers). I used pinboard to store them all, and just had to give him a link at that point.

+1

Although I understand their servers are taking a hammering at the moment