That's a good point; it will no longer be possible to obtain the MCITP:SA and MCITP:EA certifications after the 31st of July. It doesn't make much of a difference for the Sever Administrator one, as the three exams required for that (70-640,70-642 and 70-646) will get you the MCSA 2008 certification. Anybody going for the Enterprise Administrator will need to pass all of the exams before the 31st of July, however, or they will have missed their opportunity.
What material are you using to study for the 70-640 exam? I haven't gotten around to reading my copy of the Microsoft Press self-paced training kit yet. I'm hoping it contains good coverage of RMS, FS and CA as these are barely mentioned in the Trainsignal course I purchased - and they featured heavily in the exam, which annoyed me somewhat. I want to have another go at it towards the end of April, but I don't want to fail it for a third time!