Gtalk is pretty good
But google didnt miss the boat
The thing with google is they dont want to wait a long time to release a complete and perfect product, then all that is left to do is fix it up
They make something small and perfect, then they add to it
It is stated on the gtalk website they are working with other clients and services so that it can work with everything
They also said they will have Mac and Linux versions soon
And they are definently going to have Audio confrencing, video, file transfer, picture messaging (dont they have something called "hello" that is intergrated with picassa 2) as well as gaming, and blogger support.
I think they want Gtalk to be more of a Software, than a service
Soon youll be able to communicate to anybody with an IM client using an AV tool of quality
And this is only the obviuos, who knows what else is instored
im sure they will get a way to call Cells and land lines for a small fee or even for free
As for clients
I use gtalk, aim is my main one
But i like yahoo the best (although no one i know uses it)
MSN (microsft, dare i say more) isnt my cup of tea
ICQ (never used it) is pointless for me
To sum up
Its like gmail
it started out pretty simple
then they more than doubled the storage, and its always growing
and they added a bunch of features
and in my opinion it is the best email service ive ever used (and ive used plenty)
as for google trying to take over the market, i dont agree with that
googles philosohpy is "do no evil" they are fair players, they got to the top of the search world in a clean matter, all you need to do is have faith in gtalk
peace