MACTOE  This product is no longer available. They only offer the Pro version on their site now and it's twice the money at $32 so if you have a simple need, such as just recording radio streams from iTunes you may want to find other solutions.  
(Version 2.2.6)

HAPPY CUSTOMER  I recently registered Audio Hijack. Not knowing much about audio software, I'm surprised at how easy it is to use Audio Hijack. It's a high-quality program.

It works great!

Thanks to the developers.

BTW, before I registered Audio Hijack, I emailed the developers, a couple of times, with a few questions. They promptly replied. Excellent customer service.  
(Version 2.2.2)

EASER  With all of the fuss going on abut iTunes 7 and problems with both OSS 3D and VolumeLogic, I'm surprised this program isn't getting more of its due. Not only does it provide me with a broad range of effects, but it also lets me choose which programs I want to have enhanced. OSS 3D is system-wide. VolumeLogic is currently iTunes only but appears to also be developing a system-wide approach. I don't want a system-wide approach; everything on my system slows down noticeably and significantly. With Audio Hijack, nothing slows down. Give this program a try! (The developer is also very responsive to e-mails.)  
(Version 2.2.5)

JUSTINNORMAN  Audio Hijack is one of those programs that I don't use regularly, but which works well I need it to. Being able to record bits of online radio shows or the audio off Quicktime or RealPlayer movies and DVDs is a nice ability to have, and relatively easy to execute.

However, I was a bit confused with one thing when I first tried the program out. In order to "hijack" the audio of a program, you must add it to a list. When you click the "New" button at the top of the list to add a new program, an "Untitled Session" appears in the list, rather than opening a dialogue box to allow you to choose the program. Instead, you must use the Inspector window and click "Select" to get the program. It seems as though it would be less confusing and easier to use, if this step was skipped, but it's nothing major.

Audio Hijack does waht it says, and does it well.  
(Version 2.2.5)

QW3RTY  This program doesn't work with "Hold On".

http://www.macupdate.com/info.php/id/19321

Does anybody know of a program I can use to record my phone calls through the computer's modem?

Hold On plays the sound out the speaker, but Audio Hijack doesn't recognize that any sound is coming from the program. I haven't tried Audio Hijack Pro yet, maybe that will work.  
(Version 2.2.3)

MRPETEY  What an excellent application. Easy to use, very powerful. Record from file, app, URL, whatever! Great higher end features such as its collection of filters. This company puts out grade A software!  
(Version 2.2.2)

ANONYMOUS  FANTASTIC! Works perfect. Got it with Roxio's Boom Box - it's the full version and I love it.  
(Version 2.2.1)

PEETYX  I just found this after trying out their Nicecast product, and I find it to be very useful. I've started capturing BBC streams overnight with it,and it works great. It's also a great price. Should I upgrade to Pro?  
(Version 2.1.4)

ANONYMOUS  I prefer Wire Tap.Is free.  
(Version 2.1.4)

FRED RODRIGUES  kull  
(Version 2.1.4)