Hi winchester62,
I don't know of any way to do this with X10 products, but you can easily do it with some of the "I.P. cam" or security products. Problem is, none of them are cheap! You can check out this Costco link
http://www.costco.com/Browse/Product.aspx?whse=BC&topnav=&prodid=11472573&ec=BC-EC877-CatHome&pos=19&lang=en-USfor a system that does exactly what you're requesting - but it's $500 on sale!
Less expensive, but still high, are the I.P. cameras. I'm not pushing Costco, just using them as an easy place to find examples. Here's a pair for about $300.
http://www.costco.com/Browse/Product.aspx?Prodid=11483455&whse=BC&Ne=4000000&eCat=BC|79|83&N=4001405&Mo=15&No=13&Nr=P_CatalogName:BC&cat=4802&Ns=P_Price|1||P_SignDesc1&lang=en-US&Sp=C&topnav=
Doing a Google search on "IP camera" will give you tons of sources.
All-in-all, you'd probably be better to stick with AHP (with all the options) and just buy an inexpensive PC to dedicate to the purpose! You'll need a fair amount of CPU "horsepower" if you want to use video recording, etc. Right now, you can find the whole AHP package in the X10 "on sale" section for just $49.99 -
http://www.x10.com/onsale/index.htmlNot sure how much other X10 equipment you might already have, but there's a pretty good deal right now on a 6-camera system with a lot of extras for under $300. Does NOT include AHP, but does include Vanguard, so it might be enough to do what you need.
Hope that helps!
ITguy