What can I do with a single computer that has two USB wifi adapters connected to two different routers connected to my 150 Mbps network? I've read something about a static route but I don't know if it applies to me.
It likely provides you no benifit if both routers are hooked to the ISP connection. If you have 2 different ISP connection then if you work at it very hard you can use both at the same time with static routes.
With just a single ISP the wifi should not be the bottleneck.