I continue to use Delicious as I have found it the easiest way for me to quickly tag/share/store links. It hasn't seen a lot of improved features over the past few years, but now that it has been relinquished by Yahoo I expect it will only improve.

Though I don't have any direct experience with it, I have several friends who prefer XMarks.

Try http://pinboard.in/

Not free, but you're supporting an start-up. It's like Delicious without the glam.

I used delicious, switched to pinboard and also use XMarks and Instapaper too, just to throw in a tool that's a bit more than a bookmark organizer. I dropped delicious when they were going through their Yahoo issues. Wasn't really unhappy with the service but was unhappy with Yahoo.

I use each service differently:

1. Pinboard: I store links to individual articles that i want to find again. For example, i've many links to individual cool tools in my pinboard account.
2. XMarks: I use organized bookmarks inside the browser to find sites I want to read/visit on a regular basis. I've a link to just the Cool Tools front page in my browser. I then use XMarks to sync these browser bookmarks from my home Mac to my Windows computer at work (and provide an easily restored backup of all my bookmarks). I also have Safari bookmark syncing turned on for my iOS devices. This means I have the same browser bookmarks on iOS, Windows and Mac.
3. Instapaper: I use this to store the full text of articles when i'm interested in reading them offline when I travel or just having because i'm paranoid the article might age away before I get a chance to read it (local news sites can be really bad for this) or if I want an archive of it so I can refer to it later.

Depending on your needs, they're all good tools.

I'm still not exactly sure what to use myself, but for strictly bookmarking, I like using the Google Chrome bookmarks. The things I like about it are:

1) Built-in sync across browsers 2) When I save the bookmark, I can put tags in the name of the bookmark. Then rather than having to look for it, I just start typing search terms on the address field of Chrome and I get a combination of Google search results, with my bookmarks showing up with a star next to them. Real easy to find my bookmark. 3) I keep my most frequently used bookmarks on the bookmark bar at the top of the browser window. 4) It's well supported and continues to improve, which I'm not as confident will happen to other bookmarking options I've tried, some of which have gotten "improved" to the point where I hate them now. 5) It's open, so that you can export your bookmarks if you want to jump ship and go somewhere else. 6) Best of all, it's free!

I use Google Bookmarks (google.com/bookmarks). It's not fancy, but free and everything is stored in one place online, so there is no need to "sync" between browsers.

Diigo provides hugely useful tools apart from basic bookmarking [1].

These are the most handy features to me:

• Sharing a website with highlighted text and sticky notes on it with no hassle. Impressive, isn’t it?
• Its Chrome extension allows searching your Diigo bookmarks along with normal Googling.

Hello!

Try bookmax.net. It´s fast and good to handle.

Greets,

Peter

Apparently the people who did Youtube bought delicious so it might improve.