The iPlayer, the online TV on demand service from the BBC, has been downloaded more than 120,000 times in the first week after its beta launch.
The BBC predicts that the software, which gives users the chance to watch the best of the last seven days' programming, will reach 500,000 downloads within six months.
A BBC spokesperson also told The Guardian that the iPlayer would account for more than 11% of catch uP TV viewing by 2011.
Channel 4's own on demand service, 4oD, expects to reach the 500,000 mark sometime soon, having generated around 2.5m unique users and 20m downloads of TV shows and films since its launch in December.
It seems that usability problems involved with downloading the iPlayer and getting it working haven't been enough to put people off.