erupters on a RPi is fine, and easy to do
sudo apt-get install build-essential libusb-1.0-0-dev libusb-1.0-0 libcurl4-openssl-dev libncurses5-dev libudev-dev
wget
http://ck.kolivas.org/apps/cgminer/3.3/cgminer-3.3.4.tar.bz2tar xvf cgminer-3.3.4.tar.bz2
cd cgminer-3.3.4/
mkdir libusb
cd libusb
wget
http://sourceforge.net/projects/libusb/files/libusb-1.0/libusb-1.0.16-rc10/libusb-1.0.16-rc10.tar.bz2tar -xf libusb-1.0.16-rc10.tar.bz2
cd libusb-1.0.16-rc10
./configure
make
cd ../..
LIBUSB_CFLAGS="-I./libusb/libusb-1.0.16-rc10/libusb" LIBUSB_LIBS="./libusb/libusb-1.0.16-rc10/libusb/.libs/libusb-1.0.a -ludev" ./configure --enable-icarus
make
sudo make install
^ replace 3.3.4 with whatever is the latest
p2pool I'm not sure that is a good idea because of the speed of the network on the RPi but I'm willing to be proved wrong..
It has given me an Idea though I'll see if I can get it running on my tonido plug 2....