The latest version of Winamp incorporates album art and there are certainly plugins to go with it. I've never really used iTunes so it's hard to say how well it compares directly, I'd assume podcasts to be a bit more of a pain.
Essentially, I started using Winamp 8 years ago and have never had any motivation to change media player since it does all I want and I very much like the Media Library it has; I'm not specifically anti-iTunes. I can't imagine it doing everything quite the same way iTunes does but I guess it depends what you want out of it, Winamp can certainly handle podcasts in some manner.

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