The "My Orders" view on accounts simply gives a list of orders sorted chronologically with the ability to set the number of records displayed per page.
It would be ideal to give a search function for the user to be able to search/filter for orders by a number of parameters including
- Order Number
- Order Date (Including Date Range)
The only articles / extensions that i have ever found have been giving the administrator the ability to search for this. However for customers who are placing larger volumes of orders via a portal this could/would be a very useful piece of functionality