You can find out about Logic 303: Logic TNT1 here:
Basically, It was a monthly subscription of Logic tips and tricks with at least 15 minutes of tips videos released every month. It actually turned into 6 hours of Logic tips for the whole series!
Now that it's finished, if you wanted to purchase it, you would be able to download the entire series now.
There is a TNT2 currently running which started in July 2008 and ends June 2009. It runs in the same way as TNT1 (but with different topics!)
Do check out the TNT1 preview videos (follow the link above) to see if you think it's the right tutorial for you.
The tutorial began before Logic 8 was released so the June, July and August editions are using Logic 7. However, AFAIK they are completely relevant to Logic 8 too.