Browser Cam
www.browsercam.com
Theres nothing worse than spending all day designing the layout for your site only to discover that it all looks horribly wrong in another browser - and there are so many browsers to check your pages in; IE5.5 6 and 7, Firefox, Opera, Safari, konqueror to name a few. Then you have many different screen resolutions to check your site in.
To tackle this, Browser Cam offers a service whereby you can check your site layout (by way of screedshot) on all of the popular browsers. You can also pick resolutions, chose whether Java is enabled and there are several other options.
The basic package (screen capture only) is £10 per day or £200 per year and if you are really serious about browser compatability you can purchase their Premium package for £500 per year which includes priority capture service, remote access to the platforms and much more.
Sounds expensive but the service is very good - they offer one of the best money back guarantees I have seen, so they are obviously very confident of their service. If you are still not convinced, try the free trial you get 24 hours of access to the browser capture service and there is no obligation to purchase anything (they dont even take your card details).