Build 5.0.0.35 of xlsgen introduces improved comments. When an author name is specified, it is automatically added to the comment itself, in bold. Before this build, this had to be done by specific code using rich labels (i.e. text with formatting runs).
Here is how it works (C++) :
xlsgen::IXlsCommentPtr comment11 = worksheet->NewComment(3,2);
comment11->Author = L"stef";
comment11->Label = "my comment";
comment11->Translucid = TRUE;
comment11->Location(6,5,13,8);
Author name added to comments