The top AddOns in the bookmarks category (by weekly downloads). Some highlights:

Foxmarks - 110,000
StumbleUpon - 60,000
Clipmarks - 31,000
Delicious - 30,000
Yahoo Toolbar - 18,000
Yoono - 16,000
...
Mahalo - 345
Faves - 67 :-(

Foxmarks is getting 100,000 weekly downloads, and claim 2M downloads on the day of the FF3 launch.

newsgator has a SharePoint extension called Social Sites, that creates a personal profile, recommends friends and feeds via common interests and tags, and also uses Social Bookmarking to bring in content from outside the sharepoint site.

Nice list of social bookmarking sites, sorted by (published) PageRank. Does a nice job of grouping sites into tiers by popularity. Faves is listed as a PR6 site.

Bookmarking to remember to read later. Cool feature is zipping up all your pages so you can take with you on a plane when you have no Internet access.

Quoted: Meet LaterLoop, a new bookmarking tool that was recently featured at Google's I/O conference. LaterLoop's core functionality is very similar to Instapaper, which ...

Community bookmarks on MSDN and TechNet. MS's previusly announced offering, Listas, was really weak - and seemed more like someone's personal experiment, than a full blown entry by MS.

Not sure how to interpret this one - but seems targeted specifically at the developer community.

Quoted: According to Microsoft Evangalist John Martin, the company is set to release a product called “Social Bookmarks” this week. The ...

Looks like Microsoft Live Labs has shipped a very low-end outlining tool on Live Labs. It also has a toolbar that looks like it can extract web clippings.

I really don't get what this service is for. Seems like Microsoft is producing a lot of things like this lately!

DOA social bookmarking service. IE and Windows only, requires rich client download. Raised $2.2M in angel funding. They think they can be ad supported and make this go. Good luck (esp. given then very limited market and big barriers to adoption - I wouldn't even trial their (untrusted) software).

Compare to Faves.com which works cross-platform and any browser, does not require a rich download (just drag a favlet/bookmarklet), and works from any machine you roam to.

Quoted: The idea of leaving sticky notes on the Web for others to find has been tried many times, but has never really taken ...

New social bookmarking site gets coverage on TechCrunch despite launching into a super crowded space with a closed beta.

I was pretty disappointed on the lack of a 1) Faves mention or 2) any sort of analysis on the uniqueness of the service.

Seems like any startup can get a TechCrunch mention now by just offering "exclusive signups" for TechCrunch readers!

Quoted: The tagging and link-sharing market has no shortage of competition, but that doesn't seem to be deterring many developers. Mento, which has just ...