i applaud the lean methodology. minimal detail, free-tier hosted contact form. throw it out on HN and a few other sites (i've not looked, just assume) and check the your conversions per channel in a day or two. HN is a great place to see what tech-leaning people think of stuff (even if it can get a bit sideways at times) and get some free unsolicited advice on everything from implementation patterns to prior art to the occasionally valuable feature idea.