It's no secret that there will be compatibility issues with some Marketplace apps running on Windows Phones with only 256mb of RAM (like the Nokia Lumia 610). Up until now, finding out which app is or isn't compatible with the 256mb Windows Phones was done by word of mouth.
Not sure when the switch was thrown but now Microsoft has added an asterisks under system requirements in the Marketplace (website) listing for any incompatible app or game. Any app or game that won't run on 256mb devices will have "*Not available for all phones" listed beneath the required operating system.
There will be a link for more information that explains,
Some processor-intensive apps have memory requirements, and won't work on phones with 256 MB of RAM.
Some developers (such as Rovio and Angry Birds) are working on updates that will optimize these apps and games for use with the 256mb devices. Hopefully the number of asterisks on the Marketplace will start to decline.
Still the notation is nice and may prevent a little frustration when shopping for apps and games.
Thanks, Alex, for the tip!