LinkedIn- great place to join various groups and have access to companies in your line of work.  I found that some people I come across in my network are companies/websites that I would not have necessarily located with one of the search engines.  LinkedIn is also great to get some professional advice from all the people in your network.   You create a profile and the website does the work for you!  Great site to get your name out there! 

http://www.linkedin.com/home?trk=hb_home

Glam Interactive Group- womens on-line networking site.  This site allows you to get in touch with women who are always looking for new partnerships and new ventures.  You have a profile on this site and the website does the work of connecting you with other women in the industry.

http://glaminteractivenetwork.ning.com

Ecomexpo- a virtual tradeshow for the on-line marketing industry.  If your company can’t necessarily get out to the tradeshows around the US, then this is a great way to network and meet new potential partners. You can have a booth set up or just be a visitor.  Nice way to get a lot of new contacts in companies that you might already be working in or have wanted to work with.  All the work can be done from your desk.

http://www.ecomxpo.com/

youtube- great place to see some off the wall videos, but I also found it to be a place that you could locate some partners.  There are a lot of affiliate marketers doing videos and talking about various aspects of the industry.  Maybe they are a great candidate to become a partner or they have connections to those that might be interested.

http://www.youtube.com/

Trying to come up with unique ways to get new partners is something I feel that you have to do in order to grow your business.  Using these sites has helped me to come into contact with new people that I might not have ever ran into.