Can I get away with testing sites using IE8 with IE7 compatibility on?

Question

As a developer, can I safely upgrade to IE8 and use its IE7 compatibility mode to test how sites look in IE7? For IE6, I have a virtual machine and it is quite inconvenient. I d

Answer 1

Multiple IEs was listed in another answer.

There's a successor to "Multiple IEs" called Internet Explorer Collection that is more up to date.