The late, lamented Xserve.
As for the laptops, particularly the MacBook Pro. Apple has dropped the 17-in. model, typically a pro-sumer item. While some were fans of the big screen, it hasn't been a big seller in recent years. And the consumer-level Macbook is no more, potentially replaced by the combination of iPad and MacBook Air. So that leaves two types of currently-shipping MacBook Pros - the 15-in. Retina MacBook Pro, and the updated "old school" 15-in. and 13-in. models. The older models still allow for relatively easily RAM and hard drive upgrades, but the new flagship is, like iOS devices, now a sealed-unit, utterly non-upgradable. Speculation is that the rest of the MacBook Pros will go in the same direction when they get Retina displays.
A troubling trend
This is a troubling trend for many professional Apple customers, who may feel that a deliberate shift away from upgradable hardware does not meet their needs. Some of the changes point to the fact that laptops are in many ways a special case: the desire for ever thinner, lighter portable machines coupled with the need for more power, drives the decision to fill every available space in the smaller cases. The result: non-upgradeable hardware.
Case in point: batteries. The one essential accessory with every Mac laptop I've bought used to be a spare battery or two, so I could swap them out on long flights and extend my time away from an outlet. When Apple switched to internal, non-swappable batteries, it boosted battery life by cramming more capacity into the chassis, but took away the ability to switch out batteries. This is a calculated trade-off, and for many users, having a bit more battery life built-in may be more important than swapping. The other, less obvious consequence is that when the battery starts losing capacity and finally fails (as all batteries eventually do), replacing it with a new one isn't a simple matter of buying one and dropping it in.
If you want to replace it yourself, you have to crack the case (potentially voiding any warranty you may have), and do what can amount to major surgery. Apple does offer an out-of-warranty battery replacement service at a reasonable charge ($129 for the MacBook Air and most MacBook Pros, $199 for the new Retina Pro), but if a user decides to replace a Retina MacBook Pro's battery, and does it according to Apple specs, iFixit estimates a $500 cost -- ouch!
The first Mac laptop to adopt the new "sealed unit" design was the original MacBook Air, and here clearly the groundbreaking, super-slim design drove almost all of the engineering choices. Upgradeability was simply not a priority. I have a first-generation Air (now defunct), and I did end up replacing the original tiny, slow 1.8" drive with a SSD, and I replaced the battery when it failed. While I am fairly well-versed in hardware repairs, I can say that surgery on that laptop was well beyond the capability of most users -- as is now the case for the new Retina MacBook Pro. Many will either replace the entire computer, or make use of comparatively expensive upgrade solutions through third-party vendors.
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