It would be great not to prefix page name with space id while creating the link within the same space using the link creation dialog. This will allow easier copying of the spaces.

Use case:
We are using Confluence for documenting our software - each version has it own space. Space for the newer versions are being copied from the existing spaces, e.g. space for version 3.1 is created as a copy of space for version 3.0. Unfortunately absolute links like SPACE30:PageA will remain untouched and so user is navigated to the older version of space.
It would help a lot should the "linking dialog" distinguish between linking pages within the same space and creating link to the other space...