resource-friendly distro???
 

May I know which linux distros are resource-friendly????

I am planning to install it in some P2 & P3 computers

Slackware and Debian are good, as are Vector and Arch. Then there are "live" distros like Puppy and DSL, though those aren't usually well suited to being installed as a fully functional OS.

Vector Linux
http://www.vectorlinux.com/

DSL
http://www.damnsmalllinux.org/

Puppy Linux
http://www.puppylinux.org/user/viewpage.php?page_id=3

Slackware
http://www.slackware.com/

SLAX Live CD
http://www.slax.org/

BeaFanatIX
http://bea.cabarel.com/

Elive:
http://www.elivecd.org/

Deli
http://delili.lens.hl-users.com/

Luit Linux
http://luitlinux.sarovar.org/