I don't know if this helps, but I have links to these (and many more business traveler resources) on my web site:
VAT refund facilitators:
VAT Recovery Group
http://www.vrc-vatrefund.com/
VAT Refund P/L
http://www.vatrefund.com.au/
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Michael Steinberg
Editor
BizTrip
http://www.biztrip.com