You've got an idea for the next bitcoin-based service/website/product, whenever it's a new ASIC miner or a credit card to bitcoin exchange or even a shop that sells images of nyan cats. You'll need some funding to develop, work and produce the site. And you don't want to get in jail for financial fraud over offering fake "bonds" and "securities".
A site similar to Kickstarter and Indiegogo but only accepts bitcoins would be perfect for your venture. Get bitcoins, backers get rewards. Win win.
Back 10 BTC to get a GPU miner, shipped to your address or hosted in our datacenter!
Back 20 BTC to get two GPU miners, shipped to your address or hosted in our datacenter!
Back 40 BTC to get four GPU miners, shipped to your address or hosted in our datacenter!
1. You are not offering dividends.
2. You are not offering shares (ownership).
3. You are accepting funds for crowdsourcing and in return you give people products that they can choose not to redeem.
You described what I've put together at BitcoinStarter.com
. Currently, pre-boarding some projects and will opening to the bitcoin community at next week or two. We only accept bitcoin pledges and in return backers get rewards as you described. Let us know what other further ideas you have regarding crowd funding and bitcoins!