Good question! Now that you mention it, I have no idea of the original specs of any plans I've had with them over the years. The good news is that it's good news! I've had plans at other hosts where I never forgot the specs... because they never changed/improved.
I'm sure they have a precise timeline of all changes, pricing, features, sale dates, increases, etc... but I don't know of it being public info.
That would definitely be interesting info to see, since it makes them look good for staying competitive instead of just slacking off. Unless of course they're stealing other features as they add new ones, knowing that we're not paying attention. Bastards!
They could also post a timeline of company changes, to show that there was once a day when the honchos only had 2 or 3 mansions each and had to work overtime to cover both Ferrari payments. ;o)
I don't remember what happened when, but if you signed up in July, you probably didn't already have unlimited domains/sub-domains, did you? There were probably a few more upgrades/features added since then, but I don't remember which.
Save $96 at Dreamhost with the 96DOLLARSOFF promo code.