Quote Originally Posted by yungdz
Don't rev between shifts, just put it in gear but make sure you'll have enough rpm's to compensate. You can downshift to engine brake when coming to a stop, or you can downshift to boost the rpm's when trying to accelerate. (i.e you are cruising in fifth at about 3k and need to speed up fast but your car lacks the hp to just floor it and go so you downshift to a lower gear to get things moving) If you have a turbo car then you can try and doing a little clucth kick to spool the turbo but you'll end up breaking something eventually or killing your clutch

Try again?

Rev matching FTW.
'clutch kick to spool?' WTF is this? Brake boost it if you're going to do something like that.

Like everyone else has said, what rev matching or 'blipping the throttle' is, is matching your RPMs to what they will be when the clutch disengages in the lower gear. The more you do this while driving, the better you'll become at it, as you have to know your car really well to be right on the money with it. Also like everyone else said, this will allow quicker acceleration as well as less drivetrain/clutch wear and tear.