It will probably depend on the DVB-T stream. The bitrate used in dvb-T stream can vary a lot. Most countries use MPEG-2 streams and use relatively low bitrate streams. Since I have seen a N900 play a MPEG2 stream from a DVD drive, I think most DVB-T streams shouldn't be a problem.

There are tools to stream the DVB-T stream from a PC to the N900 over wifi. That way you can test if the N900 is powerful enough. It probably will be.

The driver for a DVB-T stick is bigger problem.
I tried a PCTV picostick, but compiling v4l with support for this stick didn't work on maemo for me yet, don't know why yet.
The stick is detected using the USB host kernel, so I think the N900 supplies enough power.

In the USB-Host mode topic I posted some info about what i tried:
http://talk.maemo.org/showpost.php?p...4&postcount=29