i am a HUGE google apps user....church staff i serve with, we do everything with google and talk/chat is a huge part of our everyday process....
this is one thing i wish google would do....
i wish they would take their technology that they are using to power google wave and share it with gmail....
i have gmail, my droid, and talk/chat on my desktop....now i solved the droid issue a while back...no auto sign in, no problem, but if i ever open chat on my desktop (with anticipation of not having my browser open at some point) and then go into my gmail inbox, i get a copy of everything said in chat in both places....annoying, i wish they were able to sync it to know that wherever i started a chat, to leave it there unless i signed out of that particular app. that make sense?
in regards to the email about chat comment. personally i like this. i am always moving, never sitting in one place, especially since my church is multi-site. all of our offices reside on one campus while the other campus (where i am the student pastor at) is about 15 minutes away. my time requires me to be over there a lot, away from the rest of the staff....so a chat might be open all day with someone as we talk about things....at some point the conversation might fade off as we are working on other things....i might leave to go to the other campus and the other person might have an idea or something they need to add and they dont realize i am offline at this point. chat sent, i get an email instead, everything is kosher b/c now that person doesnt have to worry about retyping it or remembering to tell me later. i know it seems like a really random, out-of-left field example, but you would be amazed how may times that happens in a day....
my wife works for a publishing company that is 1300+ employees. they went google. happens to her all the time too.
just my $.02