Ask HN: I've got a full time job I love & extra cash, I want to invest.

I consulted for years, I tried a few psudo "startups" (mainly consulting as tech or management, sometimes for free or equity). I'm currently at my first "large" company in good position with lots of movement potential. I'm making money, I'm busy learning every day, and I'm quite happy.<p>I've always saved relentlessly but now I feel like I should do something with my money. I figure I have about $150 a week I can invest in a business. It's hardly enough for a large venture but its more then enough to fund a side project. Alternatively I can invest in funds, stocks, bonds, or whatever.<p>Honestly though my gut tells me to go for small ventures. How do I work on such a small scale?