Sorry dude, but it ain't our fault. :cool:
To get to the lessons now, you'll need to sign up for a High Bandwidth Subscription.
Unfortunately, it has to do with the recent clampdown by the music industry on some of the huge tab sites. Most of the sites that are providing free tabs are committing copyright violations. (not paying royalties to the owners of the original music).

As an educational site, we're allowed a certain amount of 'fair use'.
Which means, we can show portions of copyrighted tabs in order to teach a particular technique to our paying subscribers as long as it follows certain rules and is limited to a 'portion' only.
In some cases we will pay royalties for full songs, but again this has to be limited to paying subscribers because of the huge costs involved.
Yeah, it kinda sucks.. but unfortunately if we want to keep the sight open, that's what we gotta do.