The New Google Gmail Application for Nokia Symbian .
Now there is a very easy way to Manage your Gmail on your phone, and it’s fast! . Download the new Gmail Application for mobile devices for free by pointing your phone’s web browser to http://gmail.com/app.

why should you get this new application . Because:
it’s frickin’ fast
it has the same Gmail interface you know and love
your account stays synchronized whether you access it from your computer or the phone
you can easily view attachments such as photos, documents and .pdf files etc...
it’s really, really frickin’ fast. You have no idea how fast email can be on your phone. you need to use default browser to download app from http://gmail.com/app
you should really try it ;)