What a surprise - thank you!!! 
I already considered to celebrate this anniversary somehow, but you know… I’m too busy…
Even the exact “birthday” is not clear to me. Is it the day of creation, or the day I announced the finished project? I remember that I experimented with the PIC after I won a “PICstart Kit” during a Elektor design contest (10th price for a 80C31 based MIDI mapper). For me it was obvious that the uC has to send some MIDI events first, because I already owned the tools to analyse such messages. It was also the time where a friend showed me Rebirth (for those who don’t know it: one of the first 303 and 808 emulations for PC) - it totally amazed me, but the mouse handling was so uggly, that I quickly combined my MIDI and PIC knowledge with the possibilities given by this software synthesizer (MIDI remote capabilities) - after one day the first MIDIbox was finished, and this was probably in June 1998.
The controller was only capable of sending predefined CCs, and the pots were jittering due to the poor conversion routines, but we already had a lot of fun.
I just noticed: my first song made with a MIDIbox is still available here: http://mp3.de/musik/genre/band/030303/12253/3 (Download “Do It”)
It seems that I haven’t changed my style so much in the last 10 years 
First announcement in the internet: an email to another friend at 1998-08-16 (sorry, german quote, use babelfish)
…da Du ja neuerdings ein ReBirth-Fan bist:
ich habe ja neulich bei einem Wettbewerb ein PIC-Evaluation-Kit
gewonnen, mit dem man PICs (minimal-Microcontroller) brennen kann.
Auf der Suche nach einer sinnvollen Applikation ist mir folgendes
eingefallen: eine MIDI-Controller-Box mit 8 Potis und ein paar
Schaltern. Diese kann man an jede beliebige MIDI-Schnittstelle
(z.B. an die einer Soundkarte) anschliessen und dann an einer
ReBirth-303 drehen und schrauben, wie man es von den richtigen
Teilen her gewohnt ist (die Mausbedienung ist einfach nur schlecht,
wenn man damit man vernuenftig loslegen moechte).
Falls Du also Interesse hast, kann ich Dir so ein Teil auch mal
zusammenbauen. Kostenpunkt: der PIC kostet ca. 8 DM, Potis gibt
es ab 1-2 DM, Gehaeuse kannst Du Dir ja selbst basteln. 
The interesting point: 16 DM = 8 EUR for a MIDIbox, wasn’t this attractive? 
He encouraged me to announce the controller in a newsgroup - so, this was the first announcement:
http://groups.google.com/group/de.rec.music.elektronisch/browse_thread/thread/dc5a7a8ef504ced8/1239b2e00294f6be
After this posting another guy suggested to announce the controller at Synth-DIY, a revised version was published in another Elektor magazine, etc…
…and the rest was out of my control 
I must say that I’m very happy to get in touch with so many people who already have, or who are starting with the same hobby. Some years ago it seemed that do-it-yourself in MIDI Controller and Synth area will die off because prices of ready-made units get cheaper and cheaper. I’m working hard to prove, that there is still more benefit to DIY a device instead of buying a ready-made one 
Best Regards, Thorsten.