I have a laptop with dual graphics so:
1) Nvidia GeForce GT 325M 1GB = No Problems
2) Intel GMA HD (Core i5) = Very Laggy, missing some menu options when trying to adjust graphics.
Also, I saw in another thread, that someone has noticed basically any graphics card without support for Shader Model 3.0 doesn't work properly.
Steam ID for TF2 purposes mostly: Calbearsteve