been playing guitar a while. want to take it to the next level.

what are some good approaches to learning techniques for shredding/speed?
What are they tuning, a harp? - Kurt Cobain

1961 Black Strat (Fralin pickups)
Vintage Vox Wah V846
MJM London Fuzz
Sovtek Big Muff
Fulltone Deja Vibe
Boss TU-2 Tuner
Fender Super Reverb 4x10
Go to Advanced Techniques Forum and Musician Talk forum.

People there are better equipt to help you out.

However, the main goal with shred is to play everything slowly, cleanly and accurately and only increase your speed when you can play cleanly and accurately at a selected metronome speed.

You need a metronome obviously. Also, a good thing to do is find shred songs and take the runs and turn them into excerises, try and find the Shred Manifesto by Rusty Cooley.

Learn to alternate pick, sweep, tap and legato techniques.

Hope that helps.
Sat in a lab, curing diseases. They actually LET me play with chemicals!