After compiling everything twice because of a dead hard drive, here is the short and sweet story on getting the latest and greatest beagle (0.2.1) working on your gentoo installation.
1.Add this to your /etc/portage/package.keywords
#beagle
dev-libs/gmime ~x86
app-text/wv ~x86
dev-dotnet/gsf-sharp ~x86
dev-dotnet/evolution-sharp ~x86
x11-libs/goffice ~x86
gnome-extra/libgsf ~x86
app-office/gnumeric ~x86
dev-dotnet/gconf-sharp ~x86
dev-dotnet/glade-sharp ~x86
dev-dotnet/gnomevfs-sharp ~x86
dev-dotnet/art-sharp ~x86
dev-dotnet/gnome-sharp ~x86
dev-dotnet/libgdiplus ~x86
dev-lang/mono ~x86
dev-dotnet/gtk-sharp ~x86
dev-dotnet/gecko-sharp ~x86
app-misc/beagle ~x86
2.Get updated ebuilds for beagle and gmime and put them in the associated directory in /usr/portage/…
3.Generate a digest for both ebuilds like so…
ebuild /usr/portage/dev-libs/gmime/gmime-2.1.19.ebuild digest
ebuild /usr/portage/app-misc/beagle/beagle-0.2.1.ebuild digest
4. emerge app-misc/beagle
5.Enjoy.