If you use a pseudonym just make sure you take care of the legal issues attached to it (i.e. income taxes and the IRS).
A good source for info on this topic is somewhere in a back issue of The Writer, I just can't remember when it was published, but I remember reading it. Use the search engine on writermag.com to find the article. If you don't find anything there, try Writers Digest (I subscribe to both, so maybe I read the article there, can't remember).
The IRS is constantly changing the rules for declaring a writer's income, so just make sure you educate yourself before diving into publishing under a pseudonym. Get a good tax attorney or accountant with experience representing writers.