Here's a little more reading if you like...
http://www.canreef.com/vbulletin/showthread.php?t=70442
And, yes... the RKE will log everything for a week. Also, the apps for the Droid and iPhone will apparenlty allow for data logging... ie test results, water change schedules, etc.... maybe the Apex apps have that too...? (can't wait to turf my stupid blackberry and get a real phone)