To avoid early DPF death, the received wisdon is to rev the bollix off it every now and then and get the whole thing nice and hot. The days of tootling around in top gear like a mini cab driver are over. You need to get it hot and rev it to keep the DPF alive. Might knacker the rest of the engine mind....
Steady revs in a lower gear is actually the advice now... we've had some problems with the DPF in our recently bought Octavia Scout. Actually needed a replacement which was thankfully covered under warranty.
Most manufacturers and roadside assistance outfits are now advising that the optimum is to run the car at 50mph in 4th or 5th for 10 minutes or so (steady revs) to regenerate the DPF - completely ragging it in between short journeys is apparently not a good thing for DPF life.
Oh and the DPF warning can come on on longer motorway journeys too if the regen cycle is interrupted (eg if you hit a bad patch of traffic). There is also a theory that extended running in 6th gear doesn't get the engine into the optimum temperature range to regen.
I knew none of this before buying a DPF equipped car, so buyer beware and all that... none of it's a particular problem, but you may need to adapt your driving style as mentioned above.