Tickets for the Prefontaine Classic 2010 will go on sale on March 5. From personal experience, the best seats sell out on day 1. So, haste is the name of the game. Here's a map of Hayward Field. You want to try and get something close to the finish line.
The only little complaint I usually have is that they don't have a list of athletes announced by the time the tickets are on sale. It's like Priceline, in a way. But you can think of it as booking a 5-star hotel on Priceline. You know it will be good - the athletes are guaranteed to be of top most tier. I've been going to the Pre Classic for the last three years without knowing (at the time of booking tickets) who I'll get to see. So, who have I seen so far? Alan Webb, Kenenisa Bekele, Craig Mottram, Maria Mutola, Bernard Lagat, Sanya Richards, Jenny Barringer, Nick Symmonds, Kara Goucher, Matt Tegenkamp, Dathan Ritzenhein, Asafa Powell, Jeremy Wariner, Asbel Kiprop, Gelete Burka, Jen Rhines, Pamela Jelimo, Saif Shaheen, Shalane Flanagan, Shannon Rowbury, Meserat Defar, Nick Willis. Needless to say, you will not be disappointed.
Moreover, this year marks the first year of the IAAF Diamond League, and of the 14 worldwide meets that are part of this, Eugene and New York are the only ones from the United States. So, there is no better way to spend your July 4th weekend this year than this. Mark the date.