With Google's recent announcement that they will be ending support for IE6 in March, my hope is that the few remaining clients who still ask for IE6 compatibility will mercifully cease to do so. The result will be lower costs and (possibly more valuable) way lower frustration. It's always a morale hit for the designer tasked with "make this work in IE6".
IE8 is a dream, from a designer's perspective. 9 out of 10 designs done in Firefox look pixel-perfect in IE8. It's very rare that we have any IE8-specific CSS at all. Of course, IE7 isn't remotely as good, but it's a huge leap better than IE6. When the day comes that IE7 finally joins IE6 on the scrap heap - which is almost certainly 5 years away - will we rejoice as much? Probably. From the perspective of today, though, IE7 is a big leap up from IE6 and deserves at least some praise just for trying.