Nik, when you use the site search option the words you search for are highlighted in grey but this is hard to see against the background - may be worth changing to a darker colour?
Ahh yes, this is a pet hate of mine with the phpBB styles. :x
The search code is setup to highlight using the same style as the text in the table column headings above (Author and Message) which makes no sense at all. As you generally want the table header to be a contrasting colour to the background of the table cells below, it makes it pretty impossible to find a colour for the text that stands out on both.
Aaaanyway..... i've hacked the forum code so the search results keywords now appear in bright red with a yellow highlight so they should stand out much better now
Cheers for pointing that one out, its something thats annoyed me but i've never got round to fixing.