Approval center is a neat repository for all approval requests but I believe it lacked thought into organizing all these requests. While I came across an idea to create sub-folders for different applications, I think more basic organizing techniques like Sorting, filtering will help in the near future before building more complex organization tools.
At the moment, one can only filter by title and sort by date but it would be a good idea to be able to filter/sort by other columns. For example, a manager looking to authorize time cards would love to have all of the requestor's time off requests in one place instead of having to wade through by date. (Filtering by the requestor/Sort by requestor) or look at all Vacation requests in one place etc.,