I find the one in Blues Traveler's "Hook" to be really cool, but I'd have to say that I'm not that familiar with harmonica solos in general.
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If you're a human and not feeling creative, make this your signature.
Not really a solo per se, but Stevie Jackson absolutely rips through Belle and Sebastian's Me and the Major.
http://www.youtube.com/watch?v=h5kCDtd5t68
Great stuff.
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Seth: What are you making?
Evan: I'm just drilling holes. Last two weeks, **** it.
Also, I trust you've heard Simon and Garfunkel's The Boxer? Perfect use of the bass harmonica...I mean really, who does instrumentation like that anymore?
http://www.youtube.com/watch?v=AdKjEHfHINQ
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Seth: What are you making?
Evan: I'm just drilling holes. Last two weeks, **** it.