  The extended Cuntz-Pimsner algebra E(H), introduced by Pimsner, is
constructed from a Hilbert B,B-bimodule H over a C*-algebra B. In this paper we
investigate the Haagerup invariant \Lambda(.) for these algebras, the main
result being that \Lambda(E(H))=\Lambda(B) when H is full over B. In
particular, E(H) has the completely bounded approximation property if and only
if the same is true for B.
