I couldn't find a proper list of BBC Comedy releases, so this is what I've found. Feel free to post any that I'm missing below and I'll add them in.

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BBC Radio Comedy CD Releases

15 Minute Musical
4 At The Store
Absolute Power - 4 series boxset
Alan Davies Show, The
Alan Partridge - Knowing Me, Knowing You
Ape That Got Lucky, The
Armando Iannucci's Charm Offensive - s3
Armstrong and Miller
Bleak Expectations
Boswell's Lives
Bridget Christie's Utopia
Bridget Christie Minds the Gap
Burkiss Way, The
Cabin Pressure - s1-s4 + Zurich Special
Chambers - s1-s3
Chris Morris - Blue Jam
Chris Morris and Peter Cook - Why Bother?
Clare in the Community
Consultants, The
Count Arthur Strong's Radio Show
Cowards
Dead Ringers - s1-s10
Dirk Gently's Holistic Detective Agency
Down the Line - s1-s3
Ed Reardon's Week - s1-s10
Elvenquest - s1-s4
Flight of the Conchords
Fry's English Delight
Genius - s1-s3
Giles Wemmbley Hogg Goes Off
Gloomsbury - s1-s5
Goodness Gracious Me x2, plus Comedy Zone compilation
Goon Show Classics
Griff Rhys Jones Show, The
Hamish and Dougal
Hancock
Harry Hill's Fruity Corner - s1
Hitchhiker's Guide to the Galaxy
I'm Sorry I Haven't A Clue - 1-18
In and Out of the Kitchen - s1-s3
John Finnemore's Double Acts
John Finnemore's Souvenir Programme
John Shuttleworth - Lounge Music
John Shuttleworth - Shuttleworths, The - s1-s4
John Shuttleworth - Radio Shuttleworth - s1,s2
Just a Minute - multiple releases
Laura Solon Talking And Not Talking
League of Gentlemen, The - On The Town With
Lee Mack Show, s1-s2
Les Dawson - Best Bits from his Radio Show
Little Britain
Love in Recovery
Lunch - s1-s4
Mark Steel - The Lectures (2 releases)
Mark Watson Makes the World Substantially Better
Mastering the Universe
Mel and Sue Thing, The
Micky Flanagan - What Chance Change?
Mighty Boosh, The
Milton Jones - Another Case Of
Miranda Hart's Joke Shop
Mitchell and Webb Sound, That - s1-s4
Mrs Merton Show, The
Navy Lark, The
Nebulous - s1-s3
News Quiz, The - multiple "Best Ofs", series 88,89, "Soundbites"
Now Show, The - The Best of, s45,s46
Old Harry's Game - s1-s7
On The Hour - s1,s2
Pam Ayres - various
Quanderhorn Collexion, The
Radio Active
Revolting People
Rhod Gilbert's Bulging Barrel of Laughs
Ross Noble Goes Global, s1-s3
Rowan Atkinson - The Atkinson People
Sarah Millican's Support Group
Spanking New on 7 (Standup)
Stephen Fry - Fry's English Delight
Stephen Fry - Saturday Night Fry
Think the Unthinkable
Toby Hadoke - Moths Ate My Doctor Who Scarf
Trevor's World of Sport
Uncle Mort Adventures, The Complete
Welcome to Our Village, Please Invade Carefully
Whose Line Is It Anyway?
Will Smith Presents 'The Tao of Bergerac'