If you're stuck deciding between two products but can't really tell the difference between them — whether it's two video game systems or two pieces of software — website GetComparisons will compare product reviews side-by-side to help you find the right one.
GetComparisons compares just about anything. You can pit the MacBook Air and the MacBook Pro against each other, or see what people have to say about Things vs Omnifocus for Mac. Everything is user-based, so you can even sign up and write reviews yourself to help make the page more accurate. You can't choose each product in your comparison individually — it only pits popular competing products against each other — but it's still a really neat service, and a quick way to get the lowdown on the difference between two similar products. Hit the link to check it out.