ASP.NET calendar (multiple selection)

http://forums.asp.net/t/1032656.aspx/1

http://www.beansoftware.com/ASP.NET-Tutorials/Custom-Server-Controls.aspx

http://www.4guysfromrolla.com/articles/100103-1.aspx

http://www.eggheadcafe.com/community/aspnet/17/10262350/calendar.aspx

http://forums.asp.net/t/1289185.aspx