Other than 3rd party apps, you can either use the reset button beneath the rear cover, or, an I haven't tried this on this ROM yet, but press and hold the End hard button for a few seconds until asked if you want to power off. Select yes, then once it's off hold it again to turn it back on. This did a soft reset on the stock ROM before.
EDIT: I've seen this 3rd party app mentioned often...
psShutXp 0.29 English version