Joomla CSS Guide have gone and released another free Joomla theme. Well done chaps.
The theme is called JCSS Medica and if you're running a medical based site this would be perfect but the framework would pretty much suit anything and the overall look and feel is very professional.
It's a lovely look and feel and for free you can't really go wrong. Joomla CSS Guide also release lots of tutorials and reference guides for Joomla so if you've not heard of them pop over. I'll guarantee you that you will find something of use, even if you have to look a little bit.