[Chicago Kid]

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Flop A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/heart.gif[/img]
Three checks.
Villain bets $10
I call hoping for more calls.

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No way you want to play a straight against a flush draw without charging chasers. I'm raising here.

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turn 5[img]/images/graemlins/heart.gif[/img]
Villain bets $20
I call

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To me, calling here is too passive. By calling, you go to the river wondering if your opponent has the flush, instead of knowing. Raise, and if you're reraised, get out of the way.

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River : K[img]/images/graemlins/club.gif[/img]
Villain bets $30
I raise all in.

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Let's see.... Flush on board, paired board, and you have a straight. Not only that, you have no information, since you didn't raise the turn.

Unless you have one helluva read, I'd be torn between a crying call and a fold.

You REALLY needed to gather more information on the flop and turn. You're basically blind at this point.