You won't get the max speeds. But it would help save on the battery life. I currently have the Acer Aspire 5920. I'm thinking on getting a SSD, but I would just get a bigger HDD. You could probably get a really good size hard drive for the same price of a 60GB SSD
It will definitely speed up your computer compared to the usual 5500rpm drives found in laptops but just check if you have sata 2 or sata 3 (most laptops are still sata 2) if it is buying a sata 2 ssd will probably save you some $$
That sounds like a good idea. Another thing you can do is get an external hard drive for backup just in case. Really helps having one. If you have a laptop drive laying around for sata, get a vantec nexstar Hard Drive Enclosure, they are about 8 bucks on newegg. I love mine. Depend speed. But it does take up 2 usb ports
Well, my laptop is so cruddy and old that it didn't make a huge difference. I stuck an OCZ Vertex 2 SSD in it. It sped it up a little bit and it's going to help with battery life when I get my new battery, so I am happy with that.
But as far as SSD's go overall, they are 100% worth it. Getting a samsung 840 series SSD for my computer was one of the best decisions I made for the computer itself. It runs like butter and speeds up boot time, loading times (A LOT) and a lot of other things. So go for it.