So Long And Thanks For The Original BBC Radio Series
The final episode of the original BBC radio series is online now until Tuesday afternoon, June 28th (GMT).
Based on the closing chapters of "Mostly Harmless", it features many of the original cast members, reunited to complete the series almost three decades after it first started.
http://www.bbc.co.uk/radio4/hitchhikers/
All five "phases" of the original BBC radio series will be on CD by the fall.
The first three series are available now, the last two series are coming sometime this fall.
Try Amazon.com or Amazon.co.uk for release dates and prices.