For me it all depends on the target market for the application as well as what stage I'm at. In the early stages I'll only be supporting the latest version of each of the modern browsers (no IE at all).<p>Once we are ready to start getting things into the public domain I'll start getting everything working in IE 7/8. If I'm getting requests to support IE 6 I might try to get it working but in general it's going to be more effort than it's worth.<p>I have a feeling most people would answer this questions with a firm NO.