I've used 24bit PNG images on my site wanted to use the smooth transparency effect it gives. Is this ever a problem? Does any platform/browser not support them? I don't mind if if only effects 1-2% of users.
haha. I tell all my clients I develop for current and future browsers only. I do not want to use css and javascript hacks to get things to work. I do let the end-user know that they are using an old browser by parsing their user agent and displaying a warning message.
I use PNG's all the time. I actually never use JPEG any more.