.wma to .mp3 conversion

I have a large music collection (45 GB) which has maybe 60% of its files as .wma. Yes, this is a result of a time when I didn't know any better and feverishly ripped all my legally-purchased CDs in WMP.
I've used some converters, the best of which is probably this simple Linux script.
But, trust Lifehacker to come up with something that I really need in this post on the very topic of wma >> mp3 conversion.
Haven't gone through everything yet but will do so very soon.