With this in mind you might tend to avoid any newer techniques, features or elements just to be on the safe side. But this also keeps you from using shortcuts and often results in worse quality.

If you planning to use a newer feature it might help if you knew which users won’t be able to enjoy your work to the full extend. To help everyone with this problem Alexis Deveria compiled a long list of the features and how are they supported by Internet Explorer, Firefox, Safari, Chrome and Opera. This list is even searchable and customizable to your needs (e.g. exclude browsers).

I can’t thank him enough for going through all that trouble finding these information and I am certain that this list will have a top spot in my future bookmarks and maybe in your’s too.

Link: When can I use… – a huge, searchable list of browser capabilities

There are two changes I consider “my favorites”: as Firefox is about to close the gap between itself and the highly innovative Webkit browsers Safari and Chrome, more CSS 3 properties will be supported in Version 3.1. I’m looking forward to use text-shadow because it simply looks great.
And then there is word-wrap.
Whilst other browsers – even the worst of them – have been capable of word splitting for several years, this one has been a major annoyance in Firefox. Now that v3.1 introduces word-wrapping one should be able to use narrow columns more effectively without having to be afraid of (long) words flying outside of their columns. And even for regular dimensioned sidebars, an enhanced typeface is something to look forward to.