Cor! Someone's only gone and made a version of Joost that works within your web browser, rather than making you download a dedicated application.
Phew. Now that I've ditched my valiant-yet-sluggish Mac Mini for a ninja Core 2 Duo PC, I've actually been able to get onto Joost, the Telly 2.0 service that's promising to revolutionise the way I watch TV (i.e. enable me to never have to watch Loose Women ever again).