Going back to my concern regarding the possibly mandatory use of gestures in Lion, the WWDC meeting on Monday declared that "we no longer need scroll bars because we can now "push" content using gestures. (Lion's default setting is to show scroll bars only when you gesture to scroll.)" Does this imply that those of us happy with an ordinary mouse and no track pad (I use a Mac Mini) can still use Lion without problems - by changing the default setting? I'm a little wary of how Lion might make things more difficult for me with such a simple set up.
My guess would be that, even if there's no scroll-bar control any more (with the scroll-bar only serving as an indicator of location in a page/document) scrolling via a mouse will be a simple case of click+hold grabbing the window content, and dragging it - much like how you currently navigate around a picture which has been zoomed to beyond the size of your display on any OS.
Also it seems Lion will require 2GB RAM a huge jump from Snow Leopard's 1GB. Makes me wonder whether an upgrade is worth it.
Still less than Windows (well, to get it working properly, anyway!) ;D
Besides, most Apps never use more than 2GB of RAM even when they're really gunning it, so even a relatively "small" by contemporary standards 4GB of RAM will be more than enough for the OS and a resource-intensive App, or several resource-light Apps...
I think it would be worth your money, for all the advanced features, to upgrade your RAM to 4GB - or even 8GB, if your Mini will support that much - but, of course, you don't
need to upgrade. I'm sure any new Apps for the forseeable future will still work with Snow Leopard, or even just Leopard.