Whoa! Thats quite a list :)

My favourites are: You Look Nice Today, Stephen Fry's Podgrams, Realtime with Bill Maher and Never Not Funny.

I'll definitely check out some of the podcasts you mentioned.
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Most of what I listen to is technology based but below are the top several podcast I listen to.

Technology:
This Week in Tech - http://twit.tv/twit
Leo Laporte the Tech Guy - http://twit.tv/ttg
Macbreak Weekly - http://twit.tv/mbw
Net at Night - http://twit.tv/natn


Non-Technology:
Munchast - http://twit.tv/mc
Totally Rad Show - http://totallyradshow.com/
Diggnation - http://revision3.com/diggnation/
Beer School - http://www.beerschool.com/
You Look Nice Today - http://youlooknicetoday.com/
Source(s):
http://www.apple.com/itunes/

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The podcasts you would like are probably different that the podcasts I would like. I have found that the podcasts that I like have to do with my hobbies and some personal interests. Here is a list of what I am listening to

TWIT network podcasts (http://twit.tv)
This week in Tech (TWIT)
Net @ Nite
Windows weekly

NPR podcasts (http://www.npr.org/rss/podcast/podcast_directory.php)
Car Talk
This American Life
Science Friday
Wait Wait Don't Tell me

Video Gaming podcasts
Cheap Ass Gamer or CagCast (http://www.cheapassgamer.com/archives/cat_cagcast.php)
Major Nelson's BlogCast (http://majornelson.com/archive/tags/Blogcast+_2800_MP3_2900_/default.aspx)

Political podcasts
No agenda (http://noagenda.podshow.com/feed)


All of these can be found on iTunes. iTunes is a great way to find good (and not so good) podcasts.
Source(s):
http://twit.tv
http://www.npr.org/rss/podcast/podcast_directory.php
http://www.cheapassgamer.com/archives/cat_cagcast.php
http://majornelson.com/archive/tags/Blogcast+_2800_MP3_2900_/default.aspx
http://noagenda.podshow.com/feed

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My favorite podcast is the TAPS family and TAPS pararadio podcast. I have listened to other paranormal podcasts and radio shows, but none do quite as well as TAPS.
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In addition to TWiT and In Our Time (already mentioned), I'm a fan of:

BBC - From Our Own Correspondent
(personal field reports from BBC news correspondents)
http://downloads.bbc.co.uk/podcasts/radio4/fooc/rss.xml

BBC - Mark Kermode (film reviews and "wittertainment")
http://downloads.bbc.co.uk/podcasts/fivelive/kermode/rss.xml

CBC - Quirks and Quarks (science)
http://www.cbc.ca/podcasting/includes/quirksaio.xml

BTW, until your post, I didn't know about the "Adam and Joe" and "Collins and Herring" podcasts. I loved the TV shows "Adam and Joe Show" ( http://en.wikipedia.org/wiki/The_Adam_and_Joe_Show ) and "This Morning with Richard Not Judy" ( http://en.wikipedia.org/wiki/This_Morning_With_Richard_Not_Judy ). Thanks!
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My top 10:

1. This Week in Tech (weekly tech)
http://www.twit.tv/twit
2. Mac Break Weekly (weekly tech of the Apple variety)
http://www.twit.tv/mbw
3. Buzz Out Loud (daily tech)
http://www.bol.cnet.com
4. GDGT (weekly tech)
http://www.gdgt.com
5. You Look Nice Today (humor)
http://www.youlooknicetoday.com
6. The Bitterest Bill (humor and storytelling)
http://www.thebitterestpill.com
7. The Daily Giz Wiz (daily tech and wacky gadgets)
http://www.twit.tv/dgw
8. NPR All Songs Considered (music)
http://www.npr.org/templates/rundowns/rundown.php?prgId=37
9. iPhone Alley (weekly iPhone talk)
http://www.iphonealley.com/
10. The Bugle (humor)
http://www.timesonline.co.uk/tol/news/world/us_and_americas/us_elections/the_bugle/
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I have listened to TWiT and Security Now since the first episodes.
Security Now isn't for everyone, but I have learned more about technology and the internet from that podcast than anywhere else.

I haven't kept up as regularly with the Scientific American podcast, but I enjoyed it while I listened to it.

I will have to check out some of the other podcasts listed here, thanks for asking this question.
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I'm surprised no one has mentioned Coverville (www.coverville.com), one of the earliest podcasts and still going strong. Here's a guy with a simple premise - a music show about cover tunes - that has kept him going for years now. He never strays far from the theme but always comes up with a spin to keep it interesting such as doing "cover stories" where he'll do nothing but cover songs from a single band. My favorite part might well be the "musically challenged" trivia segment at the end of many shows, which he often plays with his wife and son. Family friendly! Brian, the host, is a full time podcaster. This is not somebody who was already in the business and simply made a podcast out of his existing show, like so many NPR types of shows. This is one where just one guy managed to put something out with a high degree of consistency and quality, and I can't say enough good things about his contributions to the business.
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