Xomba you can write articles and submit bookmarks and you have the opportunity to earn money from Adsense (60% of the ad impressions are yours). For the bookmarks you have to write more than most sites - 120 words. Recently what I have been doing is for every Squidoo lens I have been building and every article I have written I have submitted a Xomba bookmark. Rather than writing new content I have just copied and pasted a paragraph from my article. This has allowed me to quickly and easily created more backlinks and earn a little money from them at the same time.
However, in the last couple of weeks Xomba have changed their rules in order to make it more of a writing community and improve its standing with the search engines. Specifically, you cannot submit duplicate content, even if it is your own. Also you are now not allowed to link to your own articles and blog posts, or as they say "bookmarks were never meant to be a marketing tool or anything like that; they should be used to share interesting links". Actually the quote is from an e-mail I received telling me that my account was suspended for a breach of these rules. I have had to reply telling them that I agree not to breach these rules in the future and I am waiting for my account to be reinstated. In the meantime, my bookmarks remain live and have still been earning me money.
In the future it would appear that the only I can use Xomba for backlinks and for increasing traffic is to write articles and to include links in the signature. Just when I thought I had found something quick and easy to boost traffic and make a little money, it is taken away.