Can I print from my ipad on my Canon MP495 printer?

If you can share that printer with other devices on your LAN, you should be able to print using AirPrint. You will have to activate AirPrint in Mac OS X if you have a Mac. Or you will need to install it on a Windows box. Then pair your iPad with your computer over Bluetooth and the shared printer should be available to your iPad for printing.

Activate in Mac OS X with this little app;

http://netputing.com/2010/11/11/airprint-hacktivator/

Install in Windows with this;

http://jaxov.com/2010/11/how-to-enable-airprint-service-on-windows/