Check out www.spinningbabies.com for tips on turning a breech baby. The site is a unstable and down a lot but does contain some really useful info. Also follow the tip on the left to see the site properly formatted.
My DD turned at about 38 weeks...painfully in the middle of the night when I rolled over in bed. I thought I had done some serious damage. It wasn't until she was delivered by elCS at 39 weeks and the OBs said she had been breech for a long time that I put two and two together about the turning though, as MW had been telling me she was head down for weeks!
There is still time so try not to worry. I'm 34 weeks with DC3 and he has only turned this week.
DD was born as a breech baby at home with IMs. It was lovely and calm
I found the two books WW listed very useful in coming to an informed decision - the Benna Waites book also has a section on ways to encourage baby to turn that you might find useful, plus it never hurts to be prepared.
All that said, there is still PLENTY of time for your baby to turn and statistics say it most likely will (IIRC something like 20% of babies are breech at 28weeks, and only 3% are breech at term), so try and relax as best you can.
ds was breech until 32 weeks. No-one ever suggested it was a problem at that stage, and I didn't even notice him turning. Spinning Babies is great if you can get your head round the crazy unique formatting