I would take dorsetpolice.com off the list, since there were more issues in the mix than strictly the geographic issue, and would include:
Barcelona.com, Inc. v. Excelentisimo Ayuntamiento de Barcelona, No. 02-1396 (4th Cir. June 2, 2003).
http://pacer.ca4.uscourts.gov/opinion.pdf/021396.P.pdf
"When we apply the Lanham Act, not Spanish law, in determining
whether Bcom, Inc.ââ¬â¢s registration and use of <barcelona.com> is
unlawful, the ineluctable conclusion follows that Bcom, Inc.ââ¬â¢s registration and use of the name "Barcelona" is not unlawful. Under the Lanham Act, and apparently even under Spanish law, the City Council could not obtain a trademark interest in a purely descriptive geographical designation that refers only to the City of Barcelona. See 15 U.S.C. ç 1052(e)(2); see also Spanish Trademark Law of 1988, Art. 11(1)(c) (forbidding registration of marks consisting exclusively of "geographical origin"). Under United States trademark law, a geographic designation can obtain trademark protection if that designation acquires secondary meaning. See, e.g., Resorts of Pinehurst, Inc. v. Pinehurst Natââ¬â¢l Corp., 148 F.3d 417, 421 (4th Cir. 1998)."
Without checking, I think the earliest UDRP case addressing the issue was stmoritz.com:
http://arbiter.wipo.int/domains/decisions/html/2000/d2000-0617.html
Interestingly, the stmoritz.com dispute was decided in the Respondent's favor, even though no response was filed.
"Importance" is a function of which one applies most accurately to your circumstances. For example, the main thread of the Barcelona appellate decision was that the lower court had erred by applying what was asserted to be Spanish law, even though it was a US court. If you have a dispute between two entities outside of the US, then the Barcelona decision is not nearly as "important" as it would be if you had a dispute between a non-US party and a US party. But, theoretically at least, court decisions should carry greater authoritative weight in a UDRP proceeding than other UDRP decisions.
Other geographic UDRP decisions include:
kapalua.com , .net
http://www.arb-forum.com/domains/decisions/95544.htm
ahmanson.org
http://arbiter.wipo.int/domains/decisions/html/2000/d2000-0858.html
puertorico.com
http://arbiter.wipo.int/domains/decisions/html/2002/d2002-1129.html
capeharbor.com, capeharbour.com
http://arbiter.wipo.int/domains/decisions/html/2000/d2000-1435.html
newportnews.com
http://www.disputes.org/eresolution/decisions/0238.htm
(this one is sort of like the canadian.biz decision, in that the complainant was not the municipality, but a business having an independent trademark)