Cityscape/Architecture Tips

Any tips to get better cityscapes and architecture photos? I would specifically like to know what are some good composition rules to follow when taking these kinds of pictures.

Effective Real Estate Photography

DOF for Architecture

pictures of city skyline at night

My favs where always pointing up from the base of the building...

I have always wanted to rent a tilt/shift lens for at least a weekend to play with for architectural shots. You could look into that, if you have money to spend.

For better cityscapes, is there anywhere you can get roof access? I have thought of asking the superintendent of random well-placed buildings, but it has never been a priority so I've never actually tried, but I figure if you asked enough of them, some of them would have the time and inclination to take you up to the roof for a few minutes.

The best advice I can think of would be to actually plan your shot. Rather than just walk down the street one day and expect good results, choose a subject, then choose a time of day when the light is best. Then go there several times (I guess this is why people shoot stuff where they live) and eventually everything comes together.

Avoid converging verticals unless it is the look you are going for.

As factorgrimm suggests, pick your times. Light would have to be the single most important thing in this field (lets face it the building isn't going to change is it? )and the quality of the light can make or break a photo.

Also reflections and shadows will alter the dynamic of the shot.