Lets take a look at the new features:
Penryn processors: larger Level 2 cache, SSE4 media instructions, less power consumption.
MacBook Pros get multi-touch trackpad, like the MacBook Air.
MacBook Pro 17-inch gets LED backlighting like the MacBook Pro 15-inch had already.
Better video cards: GeForce 8600M GT 256MB in the 15-inch Pro, 512MB in the high-end 15-inch and 17-inch Pro. The MacBooks still have integrated video.
Larger hard drives: 200GB in the 15-inch Pro, 250GB in the high-end 15-inch and 17-inch Pro, 120GB-160GB in the standard MacBooks, 250GB in the black MacBook.
Processor speed: 2.4GHz and 2.5GHz for the Pros. 2.1GHz and 2.4GHz for the MacBooks.
Memory: 2GB for all machines except the lowest-end MacBook with 1GB.
Prices are $2,799 for the 17-inch Pro, $2,499 for the high-end 15-inch Pro, $1,999 for the low-end Pro, $1,099 and $1,299 for the MacBooks and $1,499 for the black MacBook. All of the models, except the lowest-end MacBook have a superdrive (Writes CDs and DVDs). The lowest-end only writes CDs, but can read DVDs.
The Apple Store online appears to have all models in stock, listed as shipping in either 24 hours for MacBooks, or 1-3 days and 2-4 days for MacBook Pros.
The L2 cache actually went down in the lowest end MBP--from 4MB to 3MB.