There are a couple of blog posts on BizTalk Server and SQL Azure:
Another important place to find a huge amount of BizTalk related articles is the TechNet Wiki itself. The best entry point is BizTalk Server Resources on the TechNet Wiki. Read suggested related topics:
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Maheshkumar S Tiwari edited Revision 18. Comment: Minor formatting
Sandro Pereira edited Revision 17. Comment: Change Title
Steef-Jan Wiggers edited Revision 16. Comment: Added link See Also
Steef-Jan Wiggers edited Revision 12. Comment: Minor edit
Steef-Jan Wiggers edited Revision 9. Comment: Fixed TOC
Steef-Jan Wiggers edited Revision 8. Comment: Added resource link
Carsten Siemens edited Revision 7. Comment: Added tag: "has TOC"
Tord G.Nordahl edited Revision 4. Comment: added reference to norwegian copy
Steef-Jan Wiggers edited Revision 3. Comment: Added text
Steef-Jan Wiggers edited Revision 2. Comment: Added topic blogs
Steef-Jan Wiggers edited Original. Comment: Added topic MSDN Code Gallery Sample and resource links
Steef-Jan Wiggers edited Revision 1. Comment: Added resource links
Great resource, made it to my favorites! Good work!