Yep, as Daid says. Especially revision 2 dates back a long time (Nov. 2011). The history of the wiki is useful here. As well as I could I tried to explain exactly what was in which batch.
I never got around to really making a changelog except for software and firmware (because that was my thing mostly back then).
http://wiki.ultimaker.com/index.php?title=Category:Part_of_Batch_03&action=history
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Daid 306
Rev 1 and 2 are rare. (Only about 30 Rev 1 as far as I know, and 60 Rev 2) These have 8mm X/Y rods and different sliderblocks. The Rev1 machines have open backsides.
Rev 3 is usually the machine you see out there from the "early days", quite a lot of these where sold as kit and is generally regarded as the true Ultimaker. The differences from this point on have been a lot smaller. The V2 hotend and extruder upgrade where added on that (standard now), as well as some tweaks on the wood (like the 2nd feeder slot and moving the feeder motor a bit backward so it no longer hits the casing)
After Rev3 the revision tracking was not done really well, so it's hard to say what is a Rev3 and a Rev4.
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