I just knocked together a quick RSS output for the NMM collections search – just add ‘format=rss’ to the end of a search URL eg.
http://www.nmm.ac.uk/collections/requestHandlers/doQuickSearch.cfm?searchterm=london&format=rss

It hasn’t been tested at all – it’s literally five minutes old – so it tends to give XML parse errors from invalid characters in the feed. Mind you, the AADL search for ‘Montreal’ also gives XML parse errors when I try putting it through an RSS reader. I think that might be the barrier to putting out text from collections databases as RSS – XML is tricky to do properly and easy to break just by typing punctuation in an object description.