For those of you who want to see more graphic adventures (like Sierra and Lucasfilm used to make) on Symbian, there's at least two in existence called Astro Quest and Magic's Quest II.
They're by a company called MagiXoft which dedicates itself to making adventure games for Symbian Series 60, and here's an interview with them about their current and upcoming games.
The current ones are pretty standard, but the future ones look really really weird, just take one look at the Orgastic 4 teaser picture...
http://www.tapaga.com/viewpage.php?page_id=41
(If you want to have a go, you can download the locked demo versions of Astro Quest and Magic's Quest II straight onto your Symbian phone from the mobile section of Tapaga, just go to www.tapaga.com/mobile on your phone's built-in browser, even the XHTML one will do)