If you enjoy going to see live music then you should check out TicketAmerica.com. They have a huge list of arenas and stadiums all over the country. For example, they offer tickets to events at Philadelphia, New York Yankees,San Fransisco Giants, Arco Arena, Staples Center, Texas rangers, and many, many others.
The website is easy to navigate and contains all of the information you need to choose the perfect seat and area. They also have phone numbers, layouts and maps. The maps open up into a Google Map page so you can see the entire area (in case you need driving directions or just want to see if there's a restaurant or hotel nearby.)
They're touted as having the most comprehensive inventory of tickets online, and tickets are sent via FedEx. Some of the current list of shows are Kelly Clarkson, John Mayer, Leonard Cohen, No Doubt, and Neil Diamond (yes, he's still performing!) There are many, many other tickets available for other shows as well. And you can order from the comfort of your own home.