I agree with this idea, Geo.
I don't like chatspeak. It hurts my eyes. Not to mention that half of the time it doesn't make sense. I didn't know what 'brb' meant until someone informed me, so half of my time on MSN was mainly me going "Uh? What does that mean? And that?". And I'm so used to writing properly, I find it hard to use chatspeak, as I'm so used to typing quickly.
I think that lol, rofl ect ect are acceptable. Everyone uses them, nobody never has. But using 'u' instead of 'you' is just lazy. End of. Sure, if you've got to write a long text message, I suppose it's fine to use 'u' sometimes, if you're rushing. But on a computer, on the Forum, Shoutbox, or something similar? Nupe.
I don't think that using number instead of words is so bad. It won't hurt to write 1 or 2, although I agree that using letters is sometimes better - especially in a formal letter or something. Gah, I'm not sure - both of them seem OK enough to me. But, I'll go ahead and say this - I don't think that numbers counts as serious chatspeak.:)
And, of course, the punctuation bit. It can be just as annoying as lack of proper words, seeing a sentence without full stops ect.
All in all, I agree with making the "Literacy rule" more noticable. :3