i'm curious about diigo - however i love using the delicious toolbar - I have my bookmarks on my work and home pcs. The delicious toolbar was the reason I started my account. I can sort the tags based on AtoZ or by "Most Visited". This functionality is not really available in the Diigo toolbar. Right now, I have accounts with both sites.... however if you want to get me to move, the diigo needs a little improving.