Bitt and/or other grammatically inclined folk, I'm having my latest grammar crisis.

What's the ruling on using "which" vs. "that" in situations such as:

"I found more features [which/that] I was interested in."

For some reason, I cross paths with this problem 10 times a day all of the sudden. Thanks.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set