I was running late to school today (engine was already warm), and began to accelerate a bit quicker than normal (not pedal to the metal, but a bit faster), and I'm hearing a noise coming from the right side of the engine, or the wheel, and it's a quick, repeating moaning noise with a high pitch. It doesn't happen so much when the car is at high revs (4k+RPMs), but when the pedal is down about 1/2 to 3/4 of the way. I sometimes now hear it when I shift from 1st to 2nd gear and then accelerate. Any ideas?

2000 Maxima SE
5-Speed Manual
174,000 miles