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Hey Stu,
Guiding will more than likely be needed to get longer than 30 sec shots as no matter how accurate your polar alignment is, the drives will "wobble" slightly due to periodic error and due to the fact they arent the most precision mount gears around for AP.
My first (and only to date) pics of objects were quick and dirty 30 sec subs (times 8-9 stacked) using a DSLR with no guiding and to get these 9 I had to throw away about 10-15 more I took because the mount wobbled and drifted slightly and there was no guiding to bring it back on to the stars. Note, that I had VERY accurate polar alignment at the time.
I wont link them but you can check out the pics I took on the Beginner's Astrophotography forum.
Cheers
Chris
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