In general, they do not support a choice of fonts. Most don't support colour. Text emphasis is usually limited to bold and perhaps a single larger font size. You have to accept this. For users it can be a positive benefit.
Pages tend to be fast, informative and easy to read.
OK, you've pared your content down to the essentials, created pages as concise as Rolodex cards and as lacking in frivolity as a Quaker's dining room, but even the average Web page menu is too much for many PDA screens. Smaller pages means navigation on PDAs is more hierarchical than on PCs. However, cascading menu screens can be tedious and confusing for users. If your menus go more than three levels deep you're going to lose much of your audience. Forms A major factor in delivering the required content efficiently is to make heavy use of forms.