I had a similar thread on the last board, where I signposted Doctor Who audio adventures coming up on Digital radio, but I'm not sure if it was useful to many people.
The first one here is something of an event, though.
Radio4 Extra (the new name for Radio 7, a BBC digital radio station) are hosting the first Doctor Who adventures to star Tom Baker since he took off his scarf back n the 80s! They are a series of audio-dramas that were made recently by the BBC.
The 4-part series, called The Hornet's Nest will be played nightly next week, and will then be available to internet users for a week after that.
By coincidence I had the boxset in my hand the other day for these episodes and it was a ridiculous price - AU$100 or something like that. So this is a chance to get it on the cheap in these straitened times!
Continuity-obsessed fans may wish to know that these stories occur between The Invasion of Time and 'The Ribos Operation' (The Key to Time.)