Over the past year we have had to deal with major issues on website designs to make sure that the sites would view correctly in IE6 what we are finding now however is that hacks we put in for both IE6 and Safari are now breaking when viewed in IE7.
The problem a lot of web developers are going to be facing is determining what is the lesser of 2 evils. Many of the changes needed to make sites look correct in IE7 will definitely cause problems for those still on IE6 and those that use Safari very Firefox for Mac.
The best solution of course remains is to use Firefox which is the most tolerant. [IE7 Myth] (Link Submitted by Reader)