Abstract. Suppose $E$ is an elliptic curve defined over a number field $K$, and $p$ is a prime where $E$ has good ordinary reduction. We wish to study the Selmer groups of $E$ over all finite extensions $L$ of $K$ contained in the maximal ${\bf Z}_p$-power extension of $K$. Each of these Selmer groups comes equipped with a $p$-adic height pairing and a Cassels pairing. Our goal is to produce a single free Iwasawa module of finite rank with a skew-Hermitian pairing which packages all of this data. This "organizing" module should give rise to all of the intermediate groups and pairings. Using recent work of Nekov{\'a}r we can show that, under mild hypotheses, such an organizing module exists. This work is joint with Barry Mazur.