New postage rates today, Jan 17th. This (Notice 123) is always a good thing to bookmark -- shows the domestic and international rates:
http://pe.usps.gov/text/dmm300/Notice123.htm#1118064

Many rates will NOT increase. For example, it looks like all domestic first class mail rates stay the same; international letters also stays the same).
http://www.stamps.com/usps/postage-rate-increase/

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Some domestic rates:

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Some international rates:

(note: that's interesting: now any international first class parcel 1 to 8 ounces is the same rate for a particular price group!)

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Robert