Transitions from page to page:
  Color Fade In (MSIE only)
  Dissolve (MSIE only)
Image and Text manipulation:
  Mouse over
  Spiral in Text and Images
Interesting Backgrounds:
  Interesting Colors (MSIE only)
  Texture

About the only real limitation for a web site is one's imagination. We can get almost anything you've seen on another site, or program whatever you can dream up!