dev-libs/icu-4.0 was released on 2008-07-02.
dev-libs/icu-4.0.1 was released on 2009-01-15.
Created attachment 181824 [details, diff] icu-4.0.1.ebuild.patch
Upcoming openoffice-3.1 requires icu-4. http://wiki.services.openoffice.org/wiki/OOoRelease31
Fixed.