Is There *Any* Way To Increase Internal Memory?
Theoretically, of course, you could modify your hardware.  But this is not remotely feasible for 99% of us.

One thing you can do -- if you root -- is to install various apps that will allow you to move more to the SD card.  You could also try a custom ROM that is smaller than the stock ROM.  If rooted you will also be able to uninstall crapware system apps (be careful not to touch the important onces).