.. creating a holdem odds software .. need advice/critisism ..

[WingedPanther]

Unfortunately, it will involve several things:
1) analyzing what is currently on the table to determine which hands are possible
2) given what's on the table, determine the probability of each hand for each opponent
3) analyzing what is on the table and in your hand to determine which hands are possible
4) given what's on the table and in your hand, determine he probability of each hand are possible

After you do all that, you get to figure out the likelihood of winning. It's not entirely trivial, but not too hard if you know how to do the computations.

[denarced]

2) given what's on the table, determine the probability of each hand for each opponent

.. hmm .. wouldn't that be the same for each opponent ? ..
.. otherwise your structuring doesn't seem too difficult ..
.. certainly do-able ..

[WingedPanther]

In general, yes. However what one opponent gets will impact what the other opponents can get. For example, only one person can get an Ace-high straight flush.