1Up.com is reporting that the limit for LIVE Arcade titles has been raised to 250MB from the previous limit of 50MB.  The 50MB limit was originally to help those core owners that opted not to have the hard drive but it appears now that those with out the HDD will be left out in the cold.  Some titles may still be under the 50MB mark but the new limit allows for a greater range of titles to come tot he Arcade.