They will email you even if they are already 
bidding for someone else.  But as with all 
proxy bidders...you should email them way in 
advance of the ending date of the auction.

You should search the forum...it's been 
covered (other proxy bidders).  I think most 
people use celga because they know more 
about cels, understand english pretty well and 
are less expensive than other proxy bidders...