Anonymous Pro has embedded bitmaps for smaller sizes. In order to use them, you may need to disable antialiasing (depending on your OS—see below). I recommend keeping antialiasing enabled otherwise. The fonts simply don’t have the kind of high-quality TrueType hints needed for them to display well at other sizes without antialiasing. Here are some OS-specific recommendations:
MacOS: Anonymous Pro will display using Quartz antialiasing unless you disable it system-wide in the Appearance panel or in specific apps that allow it (BBEdit, TextMate, Terminal, Coda, etc.). Bitmaps will be used at the following point sizes: 10, 11, 12, and 13. Note that the 13-point bitmaps are not available when using the system-wide antialiasing supression, which only works for 12-point text or smaller.
If you use TextMate, be sure to use version 1.5.8 (1505) or later. Earlier versions have a bug which uses an incorrect line height when embedded bitmaps are present in a TTF font. (Thanks, Allan, for fixing this!)
Finally, a few older Mac apps can't handle the embedded bitmaps. If you use such an app, you can download Anonymous Pro Minus, which is identical to Anonymous Pro, except that the embedded bitmaps have been removed. Please note that this version is intended only for antialiased display. Using it with antialiasing disabled is not supported or recommended.
Windows: It’s best to enable “font smoothing” (Control Panel > Display Properties > Appearance > Effects…). When font smoothing is set to “Standard”, the embedded bitmaps will automatically be used for the following point sizes: 7, 8, 9, and 10. For other sizes, or if you prefer non-jagged type, “ClearType” is the best choice.
Linux: I don’t have any special notes for using Anonymous Pro on Linux. Many users have reported that it works well. Because of the Open Font License I’ve released it under, it has been included in some Linux distributions.