VW forums
read around there, from people who actually own them. not us computer geeks
anyway, the TDI is no rocket, but it is quite good for regular commuting. why? because of the torque. it is not a high reving engine, no diesels are, but how often do you rev to 6000 rpms, where hp is king? hardly ever. how often do you rev to 2000 rpms? every time you drive! and this is where all the torque hits; real low in the rpm range, giving you a good off-the-line pull. another bonus is the highway. in 5th gear you put along at like 2500 rpm's or so. the engine is quieter, gives great mileage, and with all that torque right around here, you can pass anything you need to without ever needing to downshift.
but read it from the experts. go visit the vw forums.