Wow, two days in a row! This has to be a record in Chris' blogging career. Now, dont get your hopes up, this two day phase is no guarantee that I might drop of the face of the blogging world for months at a time.
Just thought I would answer the burning question about the Panama Canal. "How do they do that?"
First boat enters. Then doors close. Then water is pumped into lock. Said boat raises. Doors open. Boat Exits. Repeat as nessecary.
Well, thats the idea that was envisoned since 1530 when Carlos V of Spain thought about making a transit route across Panama, what the french struggle with building for 8 years and what Americans worked on for 10 years to figure out how to build. Seems simple, but it really is interesting. I had the chance to take a cruise through the canal, so I learned plenty of interesting facts. Join me on a transit through the canal...
So first we start out in the ocean. The average boat spends about 24 hours waiting before it enters the canal. Then when it enters, a Panamanian Canal Pilot boards and takes complete control of the ship...the only time a captian ever resigns his power over the boat. Then you enter and head towards the Puente de las Americas, the bridge that was the first connection over the canal.

This is actually not in the canal, but getting close.

Ok, now this is actually in the canal, and the going under the bridge.
Okay, so after about an hour of sailing slower than I used to drive in the states, you enter the first set of Locks, called Miraflores. You can see the lock door open, the boat in front of us going in and us getting ready to go in.

The locks of the canal raise each boat 86 feet from sea level to be able to get into Gatun Lake, 86 above sea level.
And here comes the ingenious part of the canal. The water is pumped into the closed locks, completly by gravity. The control ma just opens the right pipes and in flow the water (each chamber has huge pipes running underneath it). The water is pumped at 52,000 gallons a minute into the chamber, and it takes about 8 minutes to raise a boat. There are six locks, three going up and three going down. The best way to think of them is just really big water elevators.

Here you can see the difference in the water levels from the first part where we entered and where we were after the lock had been filled with water. This was at Miraflores locks, and we are now about 8 meters above sea level.
After about three hours and two sets of locks, you find your self almost through the first portion of the canal. The tug boats come along and help your boat into position to navigate through the narrowest part of the Canal, called Culebra Cut. In this part of the canal, the traffic is one way for the largest boats, so getting it right is the most important thing.

A tugboat comes to help the cargo ship in front of us. At a rate of $3,000 per hour, the Panamanain government makes bank with "services" like the tugboat they "offer" (its more like "requirements" that they "issue").
As you enter this part of the canal, you go under the Centennial Bridge, that was supposed to be constructed as a celebration of the 100th anniversary of the Republic of Panama in 2004. However, Panamanian construction schedules prevailed, and the bridge opened only seven months ago.

The Puente Centenario, the newest connection over the Panama Canal. I dont know what was more impressive, the bridge or the overwhelmingly huge power lines...
So, then the whole reason for the locks comes into view. You actually have to cross the continental divide to go through the canal, and digging out the Canal through this area was the most difficult part of construction. Another interesting fact, the Chagres River, the river that has been dammed and holds most of the water used for the canal, is actually the only river in the world that feeds into both oceans simultaneously.

Those two mountains on each side are actually the continental divide, or what remains of it.
After this, you would pass through another set of Locks called Gatun, the largest set of locks, that would lower you all the way back to sea level. There are museums full of information on how the canal and I hope my feeble attmepts quenches the burning desire to know how one of the eight modern wonders of the world works! You can watch a transit of the each one of the locks at http://www.pancanal.com/eng/photo/camera-java.html
keep learning...