In SharePoint 2007/2010, if you have a list and you create different views on the list, you better make sure that the filters you set up actually work, otherwise your views will get no items. It is always good to leave a “All Items” view with no filters, etc. That way you can verify that your list is “working”.
Just ran into the issue where a list had 3 views, none of which had any items. You could sit and add new items all day and they would never show up. It had no “All Items” view, which I recreated and saw all the items in the list. Went into the other created filtered views and tweaked the filter and they all worked.
No need to delete that default “All Items”, I am guessing they have it there for a reason :)