I have two, and am developing a third.
One is for my main business (promotions, what is going on in the store, and so on), one started as my personal blog, but is turning into more of a PD blog, and the third one will focus on making a living without a traditional job.
Just moved the first two from blogspot to Wordpress on my own server, so that has take priority over blogging at the moment. ( it is only in the last month or so I decided to get serious about this blogging thing)
By the way, can you save a sig file to be put in each post, or do you have to type it in each time?