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Through March 4, if you buy a year of PlayStation Plus, you'll get an extra three months added to your term. This includes the memberships conferred with recent PlayStation Plus PS3 bundles.
Since the start of the "Instant Game Collection," Sony's been overcompensating spectacularly for any previous lack of interest in the Plus service, so three more months offer a valuable chance to get even more PS3 and Vita games like Gravity Rush, Jet Set Radio, Retro City Rampage, Darksiders, and LittleBigPlanet 2. Each game in the Collection is offered for a limited period, but if you download it, you have access to that game for as long as you are a Plus member.
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