Few questions in circuit

[darkjungle]

The data sheet of atmega 8 says that Avcc should be connected to vcc through a low pass filter,if adc pins are used.Is it necessary?How?
Should the reset pin be grounded through a switch?

[Admin]

I had the same question back in February:
http://www.societyofrobots.com/robotforum/index.php?topic=606.0

Should the reset pin be grounded through a switch?

No, you need that pin for the programmer.

This is what I did:
http://www.societyofrobots.com/images/sbs_avr_schematic.png