Nokia N95 running 3D games:
http://www.youtube.com/watch?v=JRZA7w_zWmM
(the name of the game is "One", get it and many more from
www.n-gage.com )
These are also available for other s60v3 phones with integrated GPU
Augmented Reality - Tower Defense:
http://www.youtube.com/watch?v=zyWVH6jkDHg
This game is free (there is also another game that also uses Augmented Reality too):
Download
These Augmented Reality games work better on s60v3 Nokia phones (N-series), but may work on other phones. Check the website for compatibility.
I'm finishing a N95-3 review that I should have posted already some days ago, but I've been quite busy lately so I couldn't finish it before.
What about we make a thread for posting everything we love about our (smart)phones, with several links to (legal) game and app downloads, cool features and the like? I could help with that...
edit:
If you want a gaming smartphone, you can compare the benchmark of real gaming in most smartphones, The benchmark tools use OpenGL 1.x. You can also download for free the tool and benchmark your own phone. The tests include a first person shooter render with different settings, rendering scenes with several different texture sizes and light sources, and least but not last real time lighting and real time shadows.
http://www.glbenchmark.com/compare.jsp
Notice how the N95 performs much better than the iPhone 2G and 3G, but Apple has completely changed their iPhone 3Gs hardware in a amazing way: it's a whole lot faster, and is now the top fastest phone on the benchmark.
Top 5 best benchmark results:
1 - Apple iPhone 3Gs - 882 points
2 - HTC T8585 HD2 - 637 points
3 - Nokia N82 - 577 points
4 - Nokia N95 - 537 points
5 - Nokia N93 - 537 points