Quite a few.
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Jadis,
Understand (and then the rest of their stuff), after hearing "Is This Real"; this, combined with discovering Marillion's
This Strange Engine, is what got me back into prog after a 10-year hiatus, so indirectly listening to this track on AM has caused me to buy dozens of prog CDs in the past few years.
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The Flower Kings,
Space Revolver (and then the rest of their stuff), after hearing "I Am The Sun (Part One)" several times.
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Shadow Gallery,
Legacy as a result of hearing "Colors" - turns out I didn't care for the rest of the album, which is more representative of their sound.
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Karnataka,
Delicate Flame of Desire as a result of hearing "Heart of Stone". I now want to buy their first two albums, but they seem to only be available as imports (about US$50 from the band's Web site, somewhat more from Amazon).
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Ten Jinn,
As On A Darkling Plain (I'm lukewarm towards this one)
I have several other artists on my "to check out" list as a result of AM, but haven't picked them up yet.
My other source of ideas is to just browse the recent arrivals at
The Laser's Edge on-line store.