While the 555
has been around a long time and has it's own "hacker" tradition built
around it, for whatever reason it isn't visible in the current
hobbyist community.
The 555 is starting to be not very visible in industry, either. There are
very few applications these days that are so simple - there always seems to
be some sort of microprocessor hanging around that can be in some ways
utilized - with the advantage of not needing the 555s resistors and
capacitors and all the issues they bring.
--
Will