I just wanted to post and say the comments on jpod101.com are mostly accurate. I actually think their lessons (even the newbie and beginner courses) are very good for people starting out in Japanese. Listening to their lessons improved my listening skills, increased my passive vocabulary, and increased my confidence to an unreasonable level
Listening skill made other Japanese material more interesting/informative, and of course recognizing more words helps too. The unreasonable confidence is probably the biggest asset though - it lead me to try playing games in Japanese, to try reading manga and novels, and generally to work above my actual level. And when I failed it provoked me to work harder on grammar and vocabulary.
Two notes on what their lessons didn't do for me though: They didn't teach me any grammer, and they didn't teach me anything about reading! None of their grammar points had any impact on me, the only grammar information I gained was from hearing things I had read about from other sources used in context. As for reading, well nothing really helps until you know the kana, and once you know those you still need some way to learn kanji
As for subscriptions: I only ever paid when they had some deal running. Paying gives you access to extra audio tracks and their pdfs. The extra audio isn't particularly helpful. Unfortunatly the pdfs are _NOT_ rendered using japanese fonts, instead all the Japanese has been converted to images? As a result you can't copy/paste from their pdfs!
So the extra media is mediocre, the pdfs are less than useful, and their 'learning center' isn't anything spectacular. I would sugest staying away from their subscriptions. Also they are a recurring payment by default and have to be 'canceled' to stop automatic deductions, and by default you get spammed every day about new lessons. In the last year or so their site and services have gotten more annoying. I think you can bypass the annoying frontpage thing by going directly to
http://www.japanesepod101.com/index.php but I'm not sure how the download restrictions work for non-subscribers now.
BTW I use DownLoadThemAll for Firefox to grab all the mp3s quickly!