One of my favorite tips for any Online Business Manager re: finding new clients is this – go shopping!
Know who your ideal client is and then do some research. Find people out there who fit that profile and get to know them… read their blogs, join their newsletters, sign up for their tweets/etc. Pay attention to who they know, who they follow and talk about as well… and get to know those people too. You could make a list of hundreds (thousands?) of business owners this way and get to know some really great folks to boot.
Decide who you want to work with and look for ways to build a relationship with them over time. Even if they don’t need to hire an OBM right now, chances are down the road they will… and the fact that you know them and their business will be a huge benefit.
My OBM Tiffany likes to call herself my “stalker”, LOL! And you better believe that a huge part of why she was hired was the fact that she knew me, she had been paying attention to what I was doing and was really excited about my biz. (For me there is nothing more important really.)