Good question. In fact, we recently released a white paper on just that topic, since there's a lot of interesting recent research on the subject of "High-Performance HMI." Our Engineers and tech writers did a lot of studying on the subject while developing our new groov product, so you'll find the white paper at the top of this page on the groov website.
Although groov was specifically designed to encourage these best practices, you could apply the same principles to any user interface. (In fact, most of the screen shots included in the white paper are NOT groov or even Opto software at all.)
Did you have a particular type of system in mind? We have some examples from a certain green submarine which had a number of PAC Display screens, but those were designed specifically for a limited-space 4.5x7.75-inch touchscreen.
FYI, Ben's PAC Display Tips and Tricks in this video pre-dates our HP-HMI research, but may be of interest too.
Also, the PAC Display fixed-resolution limitation is something our groov users are very happy to NOT have to worry about. But it looks like from some of your other posts you're already using groov too? (Many of our customers are using PAC Display and groov in combination.) Can you tell us more about your overall setup?