If your gaming group is anything like mine, rituals are the most under utilized aspect of 4e. Since the release of the newest edition of D&D, I’m not sure if one of our PCs has ever used a ritual. For me, this is because I’ve played PCs who aren’t trained in ritual casting for our long term games. When I have played PCs who have the feat, it’s been for one-off Dungeon Delves, which don’t normally require the use of rituals to progress through to the end.
Recently I’ve been considering skill challenges from the perspective of a PC and how players can make skill challenges more fun for themselves. You can only make so many Diplomacy or Perception checks before you start getting bored. If your PC is heavy on knowledge skills you may find that you have nothing to do or don’t feel qualified to fully participate in the majority of skill challenges. So you settle with assisting those PCs who are trained in the relevant skills.