Last May, I spent two days in Prague. It was a short trip, but very fun. Here are some of the best pictures I brought back with me. I know they're big, so let me know if you have any problems loading the page. I can always change it if it's annoying for people.
This is the Astronomical Clock, just off the Old Town Square. A large crowd gathers in front of it at the top of every hour, to gawk at the mechanical figures that come out and do a brief 'show'.
Just around the corner from the Astronomical Clock is the Old Town Square!

Other important buildings visible from the Old Town Square are the Church of Our Lady Before Tyn, which towers over the Tynska School in front of it, and St. Nicholas Church, photographed below.

This is a lovely picture of Prague Castle (St Vitus Cathedral), and (I think) a government building, taken from Charles Bridge. Below is a unfortunately dark picture of the courtyard entrance to Prague Castle.

This is the south side of St. Vitus Cathedral, inside the castle grounds. That's Faith in the lower left corner, in case you were curious. (The building is more interesting though. Look at that.)
This is a stained glass window inside the Cathedral that Faith snuck a picture of. Isn't it lovely?
Below are two pictures of the famous Charles Bridge; first approaching it from the east, to emphasize the number of people waiting to cross the street and get on the bridge (that's a Powder Tower on the left, the castle in the middle center, and the side of Ruddfinum Concert Hall on the right), and then just a view of some of the clutter on the southwest side of the bridge.


After visiting the castle, Faith and I climbed Petrin Hill and got some pretty views of the city. Our final destination was Petrin Tower (supposedly a 5:1 replica of the Eiffel Tower), pictured below, a cool mirror maze that was a trip highlight, and some nice gardens at the top of the hill.


This is Municipal House, the Art Deco home of the Prague Symphony and only about a block away from our hostel. Below is a mediocre picture of me in Prague (just to prove I really went, yeah? =) )


This is a picture of the gorgeous National Theatre and its cool metal-sheathed roof.

This is a picture of Wescenlas Square, the site of many important moments in Czech independence history, from the south end. Below is a picture of the National Museum, which is basically what you would see if you turned around at the spot where the Wescenlas Square picture was taken.
Intrigued? Check out these other cool Prague/Czech Republic websites:
Very interesting Prague history site.
Someone else's trip to Prague.
This site as pictures of Prague, as well as other places in the Czech Republic.