Got back from three days at the LLWS yesterday, and it was well worth the trip. A very fun experience. If you have kids who play Little League and have the opportunity to go, you should do it.
Here's some general experiences and tips for anybody who wants to attend in the future:
1) There is no admission to the complex or to the stadiums for games. But it is very crowded, at least the days we went (first Friday - Sunday, or days 2-4 or the Series). If you want to sit in the Stadiums for games, you need to get there and get in line early. They're supposed to start letting people into the stadiums an hour before the game is scheduled to start, but we noticed that they were sometimes allowing people in earlier than that. If you can't get into the stadium itself, you can always watch from the behind the outfield.
2) There are two stadiums in the complex where games are played. The International games, at least for the first 4-5 days, are held in the smaller stadium (Volunteer). Plenty of seats, but there is limited places to watch from beyond the outfield. There is a small hill behind right field, but it is very narrow and cannot hold many people.
3) The US games, and most games towards the end of the tournament are held in the larger stadium, Lamade. But there is plenty of seating on the hills behind the outfield fences. There are two "tiers" of hills, but a big portion of the upper tier is "reserved" for the kids who slide down on cardboard.
4) If you're going to sit on the hill, you'll want to bring either a blanket to sit on, or plastic chairs with the back legs cut down (by maybe 8 inches or so). The hill can be a little steep in some areas, so if you're sitting on a blanket, be prepared to slide a little.
5) Parking was not a problem, as pretty much all of the surrounding homes and businesses will let you park in their yards/lots for $5. Getting in and out was very easy.
6) Traffic was iffy getting to the complex. We were coming from the south on Route 15, and it would back up for around 2 miles before the complex. Not really completely stopped, but slow and steady movement. One BIG caveat to that: if Pennsylvania's team is in the tournament, all bets are off with regards to crowd size and traffic. Expect 2x-3x as many people. Our estimated 45 minute drive to Williamsport took an hour and 45 minutes the day we went when PA was playing.
7) The prices at the gift shop and concession stands were very reasonable. They were not price gouging for souvenirs (shirts, hats, etc) or food. The only exception was drinks. $3 for a bottle of Gatorade or 20 oz soda, or $2.25 for a 20 oz. water was pricey.