Excellent piece of software, glad I gave it a second glance instead of being turned away the first time due to the requirement of registering.
Now, a couple of small nitpicks on the custom monster card side:
1) You're missing creature type (humanoid, animate), and keywords should propably appear automatically in parenthesis
2) If a creature has Darkvision or other special senses, its Speed and Features get pushed down with the line break. Also, Darkvision shouldn't be auto-bolded
2) Lines like Attack:, Hit:, etc. should be in italics in monster statblocks, not in bold as they are in power statblocks for characters
3) When writing the monster powers, if you don't use a suggested word, it keeps suggesting that word until you accept it, it suggests a new one, or you hit Esc. It should propably disappear when you hit space like it does in most places
Aside from those, looking pretty darn good.