Slow wi-Fi internet connections and drop outs after MBP wakes up

Hello,
I have the new MBP 17 and recurring issues with the Aiport/Internet connections with my TC 500 Dual Band:
After the MBP wakes from sleep mode, I have recurring drop outs with regard to my internet connection. Airport connection shows me the full 4 bars and tells me I am connected, but Safari loads internet pages to no avail. I then usually deactivate my airport for 5 seconds, then reactivate it. The connection usually is better after that, but I do still have drop out issues every so often.
Anyone experiencing the same problem?
Would resetting SMC have any effect on this?
Thanks

I've had a similar problem at home - it's been exasperating.
It appears to be not just one thing but a collection of things causing the problems. The recent firmware update combined with driver updates in 10.5.6+ is one thing, but also there are some keychain issues, waking from sleep issues and interference issues.
When the MBP firmware was updated (10.5.6 / 10.5.7) I can't be sure exactly I noticed that my wi-fi signal was effected much more by interference. I'm using b/g as I have iPhones on the same network as my MBP at home. I ruled out router issues by testing with various other machines (Macs and PC's) - and on different wi-fi networks (my office).
The other machines didn't suffer the same problems at home and my machine did suffer the same problem at work,
I have a feeling that the driver / firmware update combined with several Airport Passwords (for the same network) appearing in your keychain conspired together to create the issue. When the Airport Signal dropped below a certain strength (by sleeping or by moving to another room) and there is a lot of interference from other wi-fi networks - your machine fails to reconnect correctly to your wi-fi network.
Often your network doesn't even show up in the available network lists. When it does - the keychain issue appears to cause a network timeout when re-connecting and therefore the connection fails and you get stuck in an annoying loop.
Moving my MBP close to the wi-fi router causes is to re-connect - which is why I believe it is related to signal strength. Also using a n only network rather than b/g helps considerably (n suffers from less interference). This however is not a fix as I have an iphone (which requires b/g) and I like to use my MBP more than 3 meters away from my wi-fi router.
Also on identical machines in my office (10.5.6 and 10.5.7) I didn't have the problem. The only real difference was those machines didn't sync with .mac and share the same keychain. Further more testing some of those machines on my home network they had no problems.
I tried loads and loads of things to fix this. In the end it wasn't one thing that did it, but a whole series of them.
1 - Delete all your Airport Passwords from your keychain.
2 - Ensure that if you are using .mac syncing you replace the .mac keychain from your current machine.
3 - Trash all your network preferences (including network interfaces and remembered networks)
4 - Zap your PRAM
5 - Resent your SMC
6 - Re-connect to your wi-fi network
And that appears to have worked for me. So far anyway.
-darrell

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