Based on Pages ’08 (3.0.2). Some of these apply to Numbers and/or Keynote as well.

Template Selection

1. The template category and template selector panes should allow type-ahead selection when either pane has keyboard focus. The category selector only jumps to categories based on the last input single character matching the first letter of a category label rather than performing string matching; if I type Le, Envelopes is selected rather than Letters. The template selection pane does not provide type-ahead selection at all.
2. Using Sim Daltonism, the yellow inner border used to indicate the selected template is hard to see for those with certain color perception impairments.
   
   This could be addressed by giving the selected template a distinct background shape.
   

Document Metadata

1. I’d like to see an Insert menu command to insert the document’s Title metadata, a variable that would automatically update when the Title is edited in the Inspector. Same with Author metadata.
2. If input before saving, the Title metadata string should be suggested in place of “untitled” as the filename when saving, with the complete text selected if the user wants to enter their own. Characters allowed in the metadata but not in filenames would be automatically replaced.

Miscellaneous

1. An Export All command in the File menu or some Automator actions to export documents in bulk would make it a lot easier to use Pages as the authoring application for documents to be viewed and edited by those using Word. The current process requires selecting the Export… command from the File menu, confirming the export format, confirming the file name, potentially accepting the replacement of an existing file, then potentially reviewing compatibility issues if special Pages dynamic information like date strings were used. For each document. All these options would have to be provided in an Automator export action, but the decisions would have to be made only once.
2. The chart data editor should display the series symbols next to their labels rather than a square color swatch.
   
3. Stealing a feature from MS Office (which is not generally recommended!), comment bubbles should display users’ IM presence status, providing a direct way to contact a person about their contribution to a document.