Sorry to have been so fast to post an incomplete response.
First, it boots as fast as the new MBA. I've timed it as fast as 16 seconds but routinely gives an 18 seconds to login screen. Obviously, not that big of a deal but is very noticeable.
Second, after logging in, it takes one second to load all my services and be ready to use. I have Growl, Syncman, Quicksilver, and several more. I mean one second before the computer is ready to use. It is crazy.
My notebook has 4GB of ram.
I was really wanting the 11.6" MBA but I could not justify chunking a perfectly new 13" MBP 2.4 Ghz with FW800 and SD card reader.
Programs bounce once and are open. Some applications bounce two maybe three times but most bounce once and open. The SSD performance increase is astounding.
So far, I can't tell any difference in battery life for the good or for the bad. OWC claims their drives use less power on, off, or whenever compared to a normal 2.5" HDD any many of the current SSD options. They also claim that their software (which claims around 7GB of overhead on the drive which is why the capacity is 240 GB instead of 250GB) keeps the drive from losing performance over the life of the drive.
I believe this is why Apple has not implemented TRIM support in Mac OSX. Apple probably believes this is best handled by the drive. It seems logical that it is better/faster for the drive to maintain the TRIM (or whatever you call it) support in the HDD itself instead of the OS. Makes sense to me anyway.
If you have a MBP, don't hesitate. This completely transformed my 13" and I truly believe that we will see SSD's start to become more prominent options going forward.
Since I don't require 1TB of storage since I use my 13" MBP as a mobile machine instead of my main machine, I don't need a lot of storage so SSD is affordable for me.