I wrote this last week:-
https://www.dropbox.com/s/24sb9660bj5fuut/git%20pull%20for%20minepeon.pdf
use a usb 2 powered hub
I am currently using the default version of BFGminer within minepeon(its slightly faster than default CGminer)
Hash rate is now at 1.25Gh per stick and will take about 20 mins to reach that speed.
There is a PC version of CG written for these sticks, If you can compile it for rPi.
The next option is to wait a few days for BFGminer to be updated, then look for the "git pull" to update minepeon again.
EDIT:-
here is a guide:- http://rdmsnippets.com/2013/07/24/mining-bitcoins-with-usb-block-erupters-a-raspberry-pi-and-minepeon/
and another:- https://bitcointalk.org/index.php?topic=251675.new;topicseen#new