is getting wordpress MU blogs considered to be spam?

Hi ,
Thanks for your attention to my thread,
I use a software to find over than 3000 wordpress MU blogs .so we can build a lot of free blogs manually.I get articles(content) from ezinearticle.com or any other free article directory sites.I register on each WORDPRESS MU blog and post different articles in different free blogs that i registered manually .Each MU free blogs has totally different article .All the article have my keywords as the anchor text.I found my nichie article in those article directories.I also put the original article source in the free Wordpress MU blogs to credit the article writer.Can anybody tell me if it is spam??please

Of cource,I dont register 1000 free blogs and post on them in one day,I do it about 5 WORDPRESS MU free blogs each day.I really appreciate your help.

OK, I'll bite... What's the program?