- I would start out grassroots-style. Attend .NET meetups to talk about your work and your project while you network. Offer promotions to these groups if they'll have them.
- Sponsor .NET Hack-a-thons?
- Help feverishly in .NET forums and community sites like Stackoverflow. (Put the service in your profile...people really look!)
- Create programs that provide incentive for your customers to spread the word about a product they already love. Word of mouth is the best/cheapest/most-effective variety of advertising that I know of.
I'm not much of a marketing guy, but this is where I would start at first thought. :) BTW, the control really does look quite nice. If I were a .NET developer I'd be interested in using it.
Note: Tag line states "No Learning Needed", then in your advantages section you state "Minimum learning needed." Strive to be consistent.