I have seen a lot of good attempts at CSS buttons (for example http://ubuwaits.github.com/css3-buttons/ )
But I haven't seen one emerge yet that is safe to use in production and meets all the following requirements:
- Looks good on all modern browsers
- Degrades gracefully on older browsers down to at least IE7 (bonus if IE6) - don't care if they look as good, as long as they aren't noticeably bad
- Works equally well on an input tag (submit button) or link (a tag)
What are the best ones people are using in production?