The only partition they usually have other than the primary is one that may be hidden with their recovery software (the OS and bundled software) in it. Of course with drives larger than 130 or so GB, you may have to partition to use all the space. Regardless of whether they do that or not, it is one of the first things I would do upon getting a packaged system. Among the logical drives I would create would be one of about 1GB just for gathering files for burning to CD. Another of 2GB would be used for the swap file and TEMP/TMP directories as well as the Temporary Internet Files directory. I try to keep writing to the C: partition to a minimum for obvious reasons.
.bh.