I used to use a tool called Total recorder, which will rip anything that is sent to your sound card, including Real Audio streams. It's not freeware nor open source, so you have to either pay for it or obtain a less-than-legit version. I've also used Streambox VCR, which is open source, but I can't remember if that is compatible with Real Audio (I think it is, but don't quote me on that).
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Links:
Total recorder -
http://www.highcriteria.com
Streambox VCR:
http://www.afterdawn.com/software/au...eambox_vcr.cfm