For any negative definite plumbed 3-manifold $M$ we construct
from its plumbed graph a graded $\Z[U]$-module. This, for rational
homology spheres, conjecturally equals the Heegaard-Floer homology of
Ozsváth and Szabó, but it has even more structure. If $M$ is a
complex singularity link then the normalized Euler-characteristic can
be compared with the analytic invariants. The Seiberg-Witten
Invariant Conjecture is discussed in the light of
this new object.
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