Yes, I know about NotesHolder, and also its author, who happens to be a fellow russian developer
Actually CintaNotes was partially inspired by NotesHolder, there was a time when I was considering using it myself but was not completely satisfied with it.
Lately he visited a forum thread about CintaNotes on RSDN.ru (Russian Software Developer Network), and told me that he liked the idea of hotkey text clipping and would implement it in NotesHolder as well.
I really welcome healthy competition since it will help me stay motivated and keep in shape "A little bit of pain never hurt anybody, if you know what I mean" (c)Soap, "Lock, Stock and Two Smoking Barrels"
I also believe that our products have a bit different niche, with NotesHolder being more for casual notetaking and CintaNotes being more project-and-research oriented, but time will tell.