Some more IRs from the net:

(1) http://www.isophonics.net/content/room-impulse-response-data-set

This collection of room impulse responses was measured in the Great Hall, the Octagon, and a classroom at the Mile End campus of Queen Mary, University of London in 2008. The measurements were created using the sine sweep technique [1] with a Genelec 8250A loudspeaker and two microphones, an omnidirectional DPA 4006 and a B-format Soundfield SPS422B.

These IRs are released under the Creative Commons Attribution-Noncommercial-Share-Alike license with attribution to the Centre for Digital Music, Queen Mary, University of London.

When using any portion of this data set, cite:

Stewart, Rebecca and Sandler, Mark. "Database of Omnidirectional and B-Format Impulse Responses", in Proc. of IEEE Int. Conf. on Acoustics, Speech, and Signal Processing (ICASSP 2010), Dallas, Texas, March 2010.

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(2) Earlier, I had wondered where the missing files for jconvolver in directory /usr/share/jconvolver/spacenet/ 
hamilton-amb.conf     maeshowe-amb.conf     
lyddington-amb.conf   yorkminster-amb.conf  

If you read the files, you get links to the original wav files, e.g.

B-format: W and X Channels 
http://space-net.org.uk/files/Minster1_000_WX_48k.wav
B-format: Y and Z Channels  
http://space-net.org.uk/files/Minster1_000_WX_48k.wav
Microphone: ORTF Neumann SKM-140
http://space-net.org.uk/files/Minster1_000_ORTF_48k.wav

Others:
Maes Howe Passage Tomb

Hamilton Mausoleum

St. Andrew's Church, Lyddington

York Minster

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 -- Niels
http://nielsmayer.com