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John_C said:
I sense that the majority within the Reformed camp affirms that tithing is still valid for a Christian today. I'm sure there are plenty of material explaining the reasons.

Here is one made froma a Q&A at III Mill.

Well I'd not tell you to doubt your senses however lets take a look at your url's statement:
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It is sometimes argued that the tithe is no longer applicable in the New Testament era, but that the rule of giving generously and cheerfully now applies. However, the New Testament nowhere revokes the command to tithe, and Jesus himself affirms it (Matt. 23:23; Luke 11:42)

So now lets take a look at the verses:
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"Woe to you, scribes and Pharisees, hypocrites! For you tithe mint and dill and cumin, and have neglected the weightier matters of the law: justice and mercy and faithfulness. These you ought to have done, without neglecting the others. (Mat 23:23)

Now I'm sorry but where in this verse is Christ affirming that under the New Covenant that tithing is still for the church?

Peter

If you believe what you like in the gospels, and reject what you don't like, it is not the gospel you believe, but yourself. Augustine of Hippo