Microsoft must be reading my blog ;-). In British English or English? I wondered why the Welsh language isn't supported in .net. Well it seems that that is changing for Windows at least. The BBC: Microsoft works on native tongues, states "The Welsh language is to be introduced into Microsoft Windows", so presumably .net culture support will come with that too.
No mention on whether the English-GB culture will be supported properly though, so that Color is spelt Colour in the Windows UI. Maybe I should start a campaign?