The amount of information available through Youtube alone. I noticed youtube now added a speed feature for every video that allows you to slow down the video but keep the pitch. I've been going back to all the old 80's-90's instructional videos that are on youtube and utilizing this feature. You can now learn basically anything, while watching the guitarist in slow motion to get all the picking mechanics, etc. There is really no excuse to not be able to improve as a guitarist with this technology available.