I am with you on this one, couldn't wait either. I ordered a 15" MBP last week and they cited a 7-10 shipping date while the 17" was immediately available. I couldn't imagine based on everything I have read in rumors and other forums that there is anything dramatic on the horizon that would in any way alter the way I use the MBP. The current build is fast enough (there will always be little bumps in speed but none big enough to wait for IMO). It's nice looking and has an LED backlit screen which is the only big thing I would have waited for if I knew it was coming and was not available in a current design. It has enough connections and is light enough, long enough battery life, sounds good, (the one I listened to in the store sounded good at least, will have to wait to see on that, have read posts of undesirable noises). fast wireless and bluetooth. In fact, except for the internal hard drive, this 15" x 1" laptop does pretty much everything my G5 desktop does in many cases better.
Why wait. Oh yeah, Leopard! Well, every forum on the internet seems to have posters who say they are waiting for Leopard before ordering in hopes that there will be a better MBP which will come with the next gen OS. So if you think waiting for a week for a 15" MBP is hard, once Leopard is released it may take a lot longer to get that new MBP in any size. Also, when it comes with the first release of Leopard, are you willing to risk the pains and sufferings of a first gen OS upgrade? Look at iLife. It is just now getting it right and that is just an application suite. Nothing near as complicated as an OS. When Tiger came out, there were many users who lost whole external hard drives from incompatible devices. May or may not happen, but there will be a lot of drivers and devices which will go through their initial rushed releases until thousands and thousands of complaining users motivate them to get it right. That may be the best time to upgrade.
IN the mean time, the current SR MBP is a superb machine and Tiger is a very mature well oiled very functional OS with interfaces with almost every 3rd party software and device.
I say order now, then sit back and enjoy the chaos unfold when the hords converge on Leopard and post Leopard laptops.