Certainly this is appropriate, especially if you indicate who you are and why you are interested. Researchers are interested in spreading their results far and wide to get citations.

The worst that can happen is that the research is not yet quite publication-ready, and the author prefers not to share it yet, to avoid academic claim-jumping. If so, you may get exactly this explanation, or no answer at all.

The best, conversely, would be that this could actually lead to a fruitful discussion and/or even collaboration.

Is it appropriate to e-mail a researcher asking about progress on a follow-up paper?
i made an HTML page with all widths and heights as percentage "that's primary for my design to work with all resolutions" but when i re-size my web browser everything will be damaged.
is there a way that when i re-size my web browser i can scroll the page? 
