The SXT images show impressive enhancement to the X-ray emission from the eastern (left) end of the region. However, no clear evidence is found for waves moving away from the region, for blobs ejected from the flare, or for the creation of cusped loops or arcade structures. We are reminded of previous nuggets discussing the link between eruptive activity and visible signatures thereof (more to the point, the lack of visible signatures thereof): 19-March-99, 26-March-99, 02-April-99, and 16-April-99. The X-ray light curve does not seem to be consistent with a "Long-Duration Event" (or alternatively, "long-decay event"), which is the usual X-ray signature of a coronal mass ejection. The lack of obvious X-ray signatures from an event clearly associated with a CME is a curiosity worth some serious thought.
Simon Plunkett, at NASA Goddard Space Flight Center, reports that the EIT and LASCO instruments on SOHO observed the event, and that LASCO imaged a halo CME. Linked here are Dr. Plunkett's email and a collection of movies from EIT and LASCO:
For more discussion of various aspects of S-shaped active regions and their link to eruptive activity, check out the following entries of SXT Weekly Notes: 24-October-97, 10-April-98, 12-June-98, 19-June-98, 09-October-98, and 23-October-98. There's some further information on a set of webpages at Montana State University.