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Wallclimbing is a glitch used to get up on high buildings/places. It works exactly the same way as Flying, but it's faster to gain height and also can be done with almost every object In-game. Another method to use, is to jump over the object and shoot it with the gravity gun, giving it vertical velocity, then grabbing and Bunnyhopping on the object up the wall. The trick is very useful in the current version of Half-Life 2 and other OrangeBox Engine games like Portal, since Flying is really limited.
The standard method of wallclimbing is to hold the object with the cylindrical, curved part of the surface facing the wall (this usually means holding the object sideways) at chest level, then to move toward the wall, and just as the object touches, to quickly jump forward and lower the object. In OrangeBox Engine, the objects tend to fall off after being stepped on, so you might want to re-grab the object too.
You can use an Autohotkey script to do all these actions for you by just holding a button.