Pulse is like a mini-blog where you can post your thoughts, quotes, phrases, or questions on your very own pulse page.  It's alot easier than blogging in that it lets you check in, and let everyone know what's on your mind.

Because of it's short nature, you can also post to your pulse through your phone. 

You can set that up here:

http://pulse.xanga.com/EditSettings.aspx

Also, you can check out the pulse of Xanga - see what everyone's thinking, talking about at the moment:

http://pulse.xanga.com