I've got Lion now and had a couple days to play with it. The big, big announcements aren't as exciting as far as I can tell for Voice Over users. In fact I took one look at Launchpad and the other thing and decided it wasn't really useful to me. Safari also has an annoying habit of reopening to the last page you visited rather than your home page, and nowhere in Safari's preferences can you turn this behaviour off. Not sure if there is something in Lion itself that can be disabled to stop this.
On the other hand single key commands in quicknav mode is an "about time" improvement. You previolusly couldn't navigate web pages by pressing H to jump to headings and that kind of thing we're all used to but now you can, and there's an easy menu to let you choose what you want each key to do. I could see the "air drop" function which lets you transfer files between two macs being useful, you don't need to be in a network to do it. It's sort of like the old sending files via infrared on things like the Pac Mate but with wireless.
It's $30 for what is essentially a combined operating system and screen reader upgrade. If that in itself isn't a no brainer I don't know what is.
I still wouldn't suggest someone buy a Mac if they already have a perfectly fine computer with screen reader though. It's something to consider very seriously if you need a new computer, it is a pretty decent option in a lot of ways, but it all comes down to what you want.
I will say though that the new MacBook Air looks only marginally less atrocious than the last. It has a core I5 processor now instead of the core 2 duo, about time, but unless you pay for lots of upgrades and get a 13 inch model you're still stuck well below 2ghz. The basic MacBook Pro isn't much more expensive than the basic MacBook Air and you get much higher specs than the Air can have at its highest maxed out version.
The new Mac Mini's dropped the core 2 duo as well and boosted the hard drive to 500gb as standard with the option of 750gb, and the price has come down but that's because it hasn't got an optical drive built in any more. If you don't use the optical drive much that's no problem, just plug in the external drive bought with the price difference when you need it if you need it, but if you regularly watch DVDs and that kind of thing on your computer it's a bit of a drawback.
cx2
-----
To live by honour and to honour life, these are our greatest strengths and our best hopes.