I am looking for a "general purpose" logic level MOSFET, just for normal applications. Does the IRL520 sound good?

http://www.mouser.com/catalog/specsheets/91298irl.pdf

It will be driven by a 5v logic signal. I am hoping do PWM also. Thanks!

 

Looks good if 0.27Ω Rds(on) is adequate for your needs. There are lots of logic level MOSFETs with lower Rds(on). For examples, check Fairchild.

 

Are all of those in the link logic level? I'm not great at reading datasheets but they appear to be normal MOSFETs.

 

Are all of those in the link logic level? I'm not great at reading datasheets but they appear to be normal MOSFETs.

Any part that has an entry in the column titled

Rds(on)
MAX at
Vgs=4.5V

is a logic level MOSFET, because Rds(on) has a guaranteed maximum value at Vgs=4.5V.