I've just registered for posting to these forums, although I've been reading them for several years.
One thing I've found is that the forum software's search function (even advanced) is a bit weak: you really have to use a plus sign in front of each term if you are using multiple terms, since otherwise the results are too numerous. Also, the results list seems in purely chronological order, I think most people want relevance order to rapidly zero in on what postings to read.
Google's indexing of the forums is far better, I think: query results are sorted by relevance, they can be re-sorted in a variety of ways by using the "Show options" panel on every Google results page, query terms are joined in a Boolean conjunction by default.
The Firefox web browser allows the creation of keywords for bookmarks, so that typing e.g. luf high iso luminance noise in the browser's address field runs the URL of the Firefox bookmark with the keyword luf and replaces every instance of %s in the bookmark URL with the rest of the terms after luf.
Such an URL to Google search the LL forums can take the form (using Google's site: and inurl: operators) http://www.google.ca/search?hl=en&q=site:luminous-landscape.com%20inurl:forum%20inurl:lofiversion%20%s which 1) restricts Google results to those from luminous-landscape.com and 2) only displays those with forum and lofiversion in the URL. Since the lofiversion of the forum contains just text, this may be a more accurate search--I haven't really done extensive testing.
This is how such a bookmark looks in the Firefox bookmarks manager:Click to view attachment
And another similar keyword search can be set up to search just LL editorial content: just replace inurl:forum and inurl:lofiversion with -inurl:forum and -inurl:lofiversion
I find these bookmarks very useful for searching LL. (You can also use the Google search operators in the Google custom search box on the LL front page.)