Tips on Hunting for Catgirls on Japanese sites:

The links that lead to Japanese language sites have been given a flag.

It can be quite difficult to find your way around, but sometimes the odd English word here and there can be of help. The galleries are also sometimes labeled "CG", which is simple enough. Watching your status bar when hovering the pointer over links, will often show an English word at the end of the html address (again, usually "CG" or "gallery").

Often it is a process of elimination - most sites will have certain English words amongst their main navigation options:
"Works" generally refers to published doujins/artbooks/datingsims,
"Links" is a common term, and is self explanatory,
"Profile" again, pretty obvious - the site owner's info,
"BBS" is a normal bulletin board page.

Images will not always have thumbnails - often a little box like this: is used as a hyperlink to an image.

Increasing numbers of sites are being laid out in a Blog format, so you may have to surf back through dates to find all their material (remember: Japanese dates are in the format yy/mm/dd).