I can't believe that UK tv here didn't renew Private Practice after season 3, forcing me to buy season 4 after getting me wrapped up in the series. I only realised it wasn't coming back when I read somewhere online that the channel that normally shows it wasn't picking up season 4.
This season is the best so far, it's a lot more sensitive, more thought-provoking, more sexy. "Ameila", "Derek Shepherd's" (from Grey's Anatomy) sister is a welcome addition to the cast, she's like a pocket rocket. A kick-ass neuro-surgeon with her own vulnerabilities.
I've only just completed the second dvd out of six and I've been crying like a baby watching it. I won't say why, you'll have to buy it and see for yourself. If you're a fan of Private Practice and you haven't seen season 4 yet, you need to get this. And very reasonably priced too. Now I'm just waiting for season 5.