I'd say that the proper course lies somewhere between the majority who say "do nothing at all but be there" and Thraeryn, who says "do it! do it!"....
Personally, in such a situation - especially if you are attracted to this person - I'd go with the following:
Tell her the truth. Tell her how attracted to her you are, but that it also wouldn't be fair to her if you were to pursue her while she's in this (somewhat) vulnerable time in her life. Tell her that you'd truly enjoy spending time with her, but that for now you'd rather take things slowly and see what's there.
Take your time. If she goes back to the husband, she'll always remember - and thank you for - your honesty, consideration and integrity. If she goes through with the divorce, then you've already laid the groundwork for a possible relationship with her.
But as always, that's just my humble opinion.
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