Let's face it: I hardly get excited anymore when I see new mountain bikes. Modern designs sure are efficient as hell, but they're not just as exciting to me as the bikes from the 80's and the 90's when all major makers and custom builders were exploring every possible way to build frames, components and suspensions. Nowadays, it seems all bikes look alike. It's boring and sad (except when you actually ride those bikes). That's probably why I keep going back to my old MBA/Mountain Bike/Mountain Biking/MTB/Bicycling magazines after depressing over a new issue. 
On top of my head, bikes that excited me back then:
-Sotello SRS
-Trimble
-Kestrel
-the first fully suspended Trek with the rubber donuts
-Crosstrac Sonoma
-Bushido
-anything by Hannebrink
-the first Proflex bikes
-Ritchey, Breezer, Otis Guy, Merlin, Litespeed, Mountain Goat, Sycip, Retrotec, Klein, Cannondale, AMP Research, JP Morgen, Mantis, etc.
Way too many to list!

On top of my head, bikes that excited me back then:
-Sotello SRS
-Trimble
-Kestrel
-the first fully suspended Trek with the rubber donuts
-Crosstrac Sonoma
-Bushido
-anything by Hannebrink
-the first Proflex bikes
-Ritchey, Breezer, Otis Guy, Merlin, Litespeed, Mountain Goat, Sycip, Retrotec, Klein, Cannondale, AMP Research, JP Morgen, Mantis, etc.
Way too many to list!