I've just worked YL2UZ, Tur, in Latvia, on 17 metres CW, which officially makes it 100 countries worked on that band. I had been at 99 for a while there but I've finally got to the century mark. Of course, it might take a while to get the 17m DXCC confirmed by QSL card. But that's another day's work!
At this moment in time I have 100 countries or more worked on three bands - 20 metres, 40 metres and now 17 metres. My next best score is 15m, where I have 81 countries worked.
Update: An hour later I worked my 101st country on 17m - Hungary!! HA5AGS was booming in on SSB. Hard to believe I hadn't got Hungary on 17m but there you go - life is full of surprises.
Update 2: A few minutes later I gave a CQ on 18.070 on CW and who was the first to come back to me? - Hungary!!!