del.icio.us is my favorite. I can use Quicksilver on my mac to instantly find by tag the link I'm looking for. - Brome

For bookmarking definitely del.icio.us in combination with local deli, Friendfeed for sharing because it aggregates all of the other services. - Werner Trotter

Google Bookmarks because it syncs with Google Notebook and my Tumblelog for sharing links. - Svartling

I've been using diigo rather than delicious and like the service. The problem is sites like FriendFeed don't include it in my stream. Still looking for FriendFeed support. I may have to start using del.icio.us again just so it is included in my stream because I do bookmark a lot of links that I want to share with others. - Ellen Moore

Google Reader Shared and Notes, definitely. - MLx

Del.icio.us which is picked up by Twitterfeed and posted to Twitter which then is picked up by FriendFeed. - Robert Sanzalone

i guess it's considered old school, but delicious still works great for me...via feedalizr - David Jacobs

I'm really big into Diigo lately. Has been really helpful in collaborating in maintaining a website. My client puts notes all over his site saying what he wants changed. I change it and not it in the note. - Bill Bittner

I'm addicted to del.icio.us: I post everything to it... well, almost everything! - Yaser Sulaiman

i love delicious. i use it for bookmarking / sharing pages i come across. I use Google Reader to bookmark / share feeds. It annoys me that I'm building up two separate repositories, is there a way to sync the two (a delicious brand feed reader spin-off would be ace!). I'm using a greasemonkey script in GReader but it's a poor substitute. Can anyone IM with a solution? - stuart brown

Each has it's merits. I'm more inclined to G Reader notes because of the convenience since I'm on Google's web services most of the time. FF will aggregates all other services. - Jonathan Kong

I use del.icio.us to bookmark. But I also use GReader, FF, Twitter, ReadBag....Ahhhhh when does it end? - KACCKCM

I used to use del.icio.us but now that you can link anywhere from in gReader, I'll almost always share w/note. I do still refer to my del.icio.us network though - I guess I'd better start contributing again. ;) - MLx

They are very different and all serve different purposes. I don't see how I can compare them. But If I had to choose 1 that I had to have over the others, it would be GReader. - Steaprok

GReader is #1 for me by a wide margin. - Kevin D. White

Google reader - Ethan Klapper

I go to the optimal opportunity to share. del.icio.us All this talk of buying Yahoo. If Yahoo bought friendfeed there would be no need to sell. think about it. Yahoo suffers from fragmentation and no centralized core. - Noah David Simon