For certain individuals upgrading to Creative Suite 4 Design Standard
If you are a Windows user upgrading to Creative Suite 4 Design Standard from any edition of Creative Suite 1.x or 2.x, buy the upgrade with the product number 65019872.
Adobe refused to give me this number so I could be certain the product I ordered from a less-expensive-than-their-store reseller was the correct one. Luckily, it was—so I am posting it on the internet, because there is no good reason whatsoever why this information should be withheld from anyone.
By the way, if you planned on waiting until later this year to make the big jump from CS1 to CS5? Don’t. Per Adobe’s “three-versions-back product upgrade policy”:
For individual products [and Creative Suites], you can upgrade from up to three versions back. For example, if you have Illustrator CS, CS2, or CS3, you are eligible for the upgrade price for Illustrator CS4. If you have an earlier version, for example, Illustrator 9 or 10, you are not eligible. The exception is Adobe Premiere Pro; you are eligible to upgrade from any earlier version to Adobe Premiere Pro CS4.
For individual products [and Creative Suites], if you have a version earlier than three versions back, you are not eligible for upgrade pricing — you will need to pay the full retail price.
Emphasis mine.