For those who don’t know an ogonek from a retroflex hook — and sometimes for those who do — finding a needed letter with a diacritical mark can be a time-consuming process. (I look forward to the days when combining marks are much better supported.)
So I made a chart with lots of — but certainly not all — diacritics, sorted alphabetically by appearance as well as name and sound. That means, for example, that a thorn (þ) can be found under p as well as under t (as in th), even though — I know, I know — p and þ are unrelated.
Perhaps some people will find it quicker to use than going through the various Unicode charts or searching through various other charts in which the letters are grouped by sound rather than appearance. Someone has probably already made one of these, and done a better job. But I didn’t have any luck finding it before hacking out my own.
Here it is, for what it’s worth: letters with diacritical marks, grouped alphabetically.
I hope some people find it useful.