While Windows Phone 7 is still excluded mostly from the Instagram party, Metrogram, a new Instagram viewer, does allow users to get a look in.
The app allow one to browse popular photo on Instagram and share them on your own social network.
The app does not however allow one to log in or post pictures to the Instagram network. Interestingly the developer claims the next update will enable user profile login, browse users photos and search the network.
Metrogram is free and can be found in Marketplace here.
Thanks PWS for the tip.