...just received an email:
It's not a problem with the application - there is a server issue we are experiencing - the whole team is working on fixing the problem, which we hope will be resolved later today. Please bear with us.
To stay up to speed follow us at http://twitter.com/GPush4iPhone
Dave - Team GPush @gpush4iPhone...
You need to supply your Gmail password to Gpush. On their end, presumably on their servers, your gmail account is constantly accessed. Once a new mail is received they know it, because they are logged in as you. They then send you a push notification, and you can then check Gmail manually.
I don't really know anything about this company other than they were planning to release Gpush, released it, then had to pull it because of server issues. Guess I'm not comfortable with them having access to nearly all of my email.
What I do now is have my gmail forwarded to MobileMe. Actually I only have mail I consider important forwarded to MobileMe, primarily so I can get a push notification. I still check my mail on the iPhone via Gmail. I didn't find push sped up the checking email process all that much anyway.
But, with GPush, I'm really not sure what to say now. I wish I never bought it, but more importantly never signed up to it. The money is not the issue here, just the whole server thing. It just tells me they were not really ready...