Where are good sites to advertise?

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I want to advertise my fundraising program and my business-to-business program that I have through my business. Does anyone know of some really great places to advertise these types of programs? I am already doing a great job on myspace, but I wanted to expand some. I am doing word of mouth advertising in my local area. I'm also sending out letters to businesses. What else is there? These are some really great programs and I want people to benefit from them. I really want to be able to tell everyone about them. So...if anyone on here needs a fundraiser, let me know. And if your business needs some pep, let's talk. But please please give me some advertising ideas. Thanks bunches.