It would be great to have more matches on the internet, gary, but unfortunately very few tournaments offer this, usually because they've sold their TV rights to companies who want folks to pay to see the coverage.
The Grand Slams have started to offer internet video broadcasts (although I'm not sure whether they are live), for a nominal fee. I wouldn't be surprised if the men's masters' series follow this eventually, although they don't seem to have the same level of technology that the ITF does with IBM.
There are a couple of tournaments that do offer free broadcasts. One is Rotterdam, which is coming up a couple of weeks after the AO; another is Kitzbuehel (in fact all Austrian men's tournaments: Kitz, Vienna and St Poelten are covered live on tw1.at), and for those in the UK, the BBC offers Queen's (and possibly Eastbourne?) live on their website.
If anyone knows of any others, post them here