Freeter

This app is either exactly what you need (as it was for me, a Web and App developer by trade), or it will leave you stumped. Download it, give it a try, and see what happens. I tried the free version and almost immediately purchased the Pro version (not because I needed to, but because I like to support things that make my work easier). If nothing else, the ability to log into the same Web app using two different accounts (at the same time) is worth the price of admission.

There's really nothing else like this out there (which is surprising, as once you use it, it's hard to think why nobody has made it before).

Freeter has totally streamlined the way I work. The ability to have a series of workspaces configured around the web apps I use or consult all the time is a massive productivity gain, especially having two or more in the same screen. The free version will be plenty for most, but I upgraded after an hour. The company is responsive, too — a minor issue I had in 1.0 has been fixed straight away in 1.1. Definitely worth taking for a spin: if it suits the way you work, you're going to love it.

I always thought it a bit disingenuous for a dev to charge folks to be beta testers, even if it's discounted 10%. Make the beta a time-restricted build then offer beta testers who actually provided feedback a discount when you go with the 1.0 version.