(Warning - The first paragraph is from the Explorations in Connecticut Genealogy blog.)
Written by Julie Cahill Tarr, GenBlog covers topics in genealogical research. Posts feature lists of useful articles, resource links, and book reviews. The author is a professional genealogist. Posts reflect her interests. They're worth a read just in case your interests overlap.
She recently wrote a nice post on Luxembourg resources. While many of these sites are ones that you would have seen before, a few were new to me. Take a look at the links page by page. One of those new suggestions may help you break through a brick wall.