HAs been running the RC on XP on my T60p with 4Gb and 200 GB 7200 disk. compared to the previous version I have a couple of things you may want to check before final release.
1) X1 appear often unresponsive when hitting Ctrl-Alt-L. Even when clicking on the icon, X1 takes MUCH longer before the window pops up. Its is NOT disk I/o that appears to block but CPU. As a side issue, that must be a weakness compared to Vista's responsivenes.
2) DAte/Time title in right side header field for file searching appears to long and makes the header field look unaligned.
3) Should be minor - but actually is not. the choice of fionts in the search result window may appear too large to some. I do not know if there is some ressource that can be set to change this, but it is difficult to get the overview when the window is full. Great for us who wo not have the eyes
4) It appears that X1 sporadically misses indexing certain mails in the inbox (Office 2007) even when it has been activated permanently