Great science related podcasts

Astronomy Cast
Astronomy Cast is a great podcast featuring one topic each week and occasionally features a question show. Here's the description of the podcast from the Astronomy Cast website: "Astronomy Cast takes a fact based journey through the cosmos as it offers listeners weekly discussions on astronomical topics ranging from planets to cosmology. Hosted by Fraser Cain (Universe Today) and Dr. Pamela L. Gay (SIUE), this show brings the questions of an avid astronomy lover direct to an astronomer. Together Fraser and Pamela explore what is known and being discovered about the universe around us."
Approx. Length: 30 min.

Check it out at: http://www.astronomycast.com/


365 Days of Astronomy
Every day during 2009, the International Year of Astronomy, a new podcast is released made by various volunteers around the world. The volunteer podcaster creates a podcast about any subject of their choosing. A few of the podcast topics so far include: Tips for Your First Telescope, Understanding Variable Stars, The Man Who Beat Galileo, and way more.
Approx. Length: 10 min.

Check the 365 Days of Astronomy podcast out at: http://365daysofastronomy.org/

Skeptics Guide to the Universe (SGU)
The Skeptics Guide are "your guide to reality". Each show features discussions on pseudoscience, science related articles, an interview of a skeptic, a science or fiction segment - where they challenge the audience to determine which "discoveries" are science and which is fiction - and finally a quote from Bob.
Approx. Length: 1 hour 20 min.

Check out the wicked SGU podcast at: http://www.theskepticsguide.org/

SGU 5x5
The Skeptics Guide (SGU) to the Universe release this weekly podcast. The SGU panel discuss one topic per episode, usually debunking pseudoscience or discussing other important topics in regards with critical thinking.
Approx. Length: 5 min.

For 5 minutes with 5 skeptics go to: http://www.theskepticsguide.org/

Quirks and Quarks
Quirks and Quarks features a few topics each weeks where Bob McDonald, the host, interviews a specialist in the field of some recent discoveries.
Approx. Length: 53 min.

See what quirky science is going on, check out: http://www.cbc.ca/quirks/


And for those Mac fans out there:

MacCast
MacCast is a (usually) weekly podcast that keeps you up-to-date on what's up in the Mac world. This podcast covers Apple announcements, rumors, and more.
Approx. Length: 1 hour 20 min.

Check out what's going on in the Mac world at: http://www.maccast.com/