Spherical ships in Science Fiction (just off the top of my head):

The Kzinti warships (pre hyperdrive) (Larry Niven-Known Space series)


Most of Clarke's ships (two spheres joined by a lond tube to seperate the drive from the crew)

Titan A.E. (the big one they're looking for)

The ons from an Alan Norse (I think) book I read once (can't remember the title--synopsis: young man finds what turns out to be an alien map showing the planet betweeen Mars and Jupiter before it turned into the Asteroid belt [sorry-last time I read it was over 20 years ago, and the science was right for the time it was written]. I seem to remember corporate warfare/piracy involved somehow...)

T.I.E. fighters (most of them)

I think Psshtpok's ship had at least two sherical sections (not sure about the drive section--I think it was a double torus) (Larry Niven-Protector/Known Space series)

Puppeteer General Products #1 and #4 hulls (Larry Niven-Known Space series)

does a Dyson Sphere qualify here too?

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"Light thinks it travels faster than anything but it is wrong. No matter how fast light travels it finds the darkness has always got there first, and is waiting for it." — Terry Pratchett, Reaper Man

441!!!! :)