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I really like ASN.1. I was first introduced to it way back in 1984 when the encoding standard was called .X409. It was used on Prime Computers for some of its client/server software and proved to be a boon when the protocol had to change, due to the use of sets and version numbers. Sadly, I have not seen it used much since, except of course in a few standard internet protocols.
There is a useful book on ASN.1 that you might find interesting.
I did some work on ESNACC, an extended version of SNACC, an old ASN.1 compiler. ESNACC started because SNACC was an old orphaned project with no support for either C++ or DER and PER (SNACC was old BER only). Work on ESNACC gradually fizzled out. The mailing list is still available online but it is no longer in use.
Some time later I found out there is effectively a replacement for ESNACC, asn1c, which seems to be significantly better than either SNACC or ESNACC. but I have not had a chance to try it out yet.
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