I've noticed that several Live Arcade titles don't have a system listed for them, just "Xbox Game Store" this works for systems like the Wii and DSI because only one system can access the shop. However "Xbox Game Store" as we define it can be used across two systems with each only having a limited selection of titles. Should we not also list them for the system they're on? For instance Rez HD would be listed under "Xbox Game Store" and "Xbox 360" because while it's accessed from the store in general, it can only be played on the 360.
EDIT: Ok so I've been able to see that on an actual games page they are listed by platform, but when sorting through the tags you only have one generic "XBGS" tag which still I think needs to be addressed.