I doubt you will find many apps to do that.

I have used RRDTool for graphing. RRDtool is sort of a database in itself. I made myself an anemometer based on a 16f628A which spits out data and logs to an RRD for display on my web server. Mine runs on linux/php, not Windows but you're welcome to it though.... I can't see reason you could not port the setup to windows - I belive there is an RRDTool for win32 and PHP is definately doable. Where you might get stuck is on the serial coms class i use.

VB is very easy to work with serial ports and VBExpress is free if you have to use windows.