I regularly scour the 3D Warehouse for Sci-Fi stuff (and generally the most insanely-detailed models), but one of my favorite modelers (Jay Thurman, aka cyberia23) just made me very happy with his most recent uploads...

Serenity - Firefly-class Mid-bulk Transport (v 1.1)

Serenity (Firefly) Hover Mule

Serenity cargo shuttles (Firefly)

And another one of my "Holy Grails"...

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The Bebop (from Cowboy Bebop)

(My other favorite SketchUp artist, TaffGoch, did Faye's Red Tail very nicely!)

He's also done just about every ship from Blake's 7, as well as...

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Dark Star

MST3K - The Satellite of Love (v. 1.1)

You can download SketchUp here.

Enjoy!