Earning Points. Starwood's Preferred Guest program is fairly straightforward: the more nights you spend at participating hotels, the faster you'll earn a free night.
The mapper output (intermediate data) is stored on the Local file system (NOT HDFS) of each individual mapper nodes. This is typically a temporary directory location which can be setup in config by the hadoop administrator. The intermediate data is cleaned up after the Hadoop Job completes.
No. LILO stores information about the location of its own map file in the MBR; GRUB can optionally do this too, and the only way it can avoid it is the horribly fragile stick-stage-1.5-in-unallocated-sectors kludge. Unlike LILO, GRUB has a web site.