There is simply no replacement for using Teamspeak. NONE. But we also use our comment box on the XMB to let the guys that aren't using when we're starting racing. It's quick and easy plus it lets everybody on your friends list know at the exact same time when you're going.
Like my friend Forgetful said, I can't believe you GTP guys aren't using Teamspeak or some other form of VoIP like Ventrillo. The chat system you guys have set up is a novel idea but I'm not so hot a typing while I drive and I doubt that anyone else here is either. Serious guys, if you've got the computer to log on here and post then you have the ability to be speaking with your fellow competitors. As it sits now we're seeing alot more of names flying the GTP tag on our Teamspeak server and I would doubt that we'll see that trend change as word gets out among your members.
Here's the typical list of reasons given not to get on Teamspeak:
1) My computer is too far away from my PS3 - LOL, Bluetooth, Bluetooth, Bluetooth
2) I'm no computer whiz and won't be able to get it set up - Nice try, it's as easy as it gets.
3) Many of my friends aren't using the system - They will be once you pass along the word of how much it opens up the game.
4) I don't need it - Yes, yes you do. This one little tool has kicked open so many doors for us. It's given us the ability to organize events weekly and our numbers are growing constantly.
No offense to you GTPers, I have much respect for you guys and some of my favorite guys to race with are flying your tag, but you guys really REALLY need to get up to speed. You're truly missing out.