It is one of the best sites I have seen. I didn't know about it until it was posted on the GMB a while back. The site answers a lot of questions on Imperial, Dugan, Kralik, and others. I had used his Loetz.com for a couple of years. I hope that if for some reason the sites are removed that he will put them in book form. Excellent information. I am still missing the AOL Hometown Loetz sites.
BTW, there is a page on the site that may help to answer a couple of questions we had in the past about some spatter glass that looks like marbling.
http://sites.google.com/site/loetzandglass/czech-jugendstil--other-makers