I've located the spreadsheet and have updated it to include some of the ones from last year that had not been included. It does indeed appear that F9200000-F923FFFF can be your range, BartonThinks. It also appears we'll be able to continue this block pattern until we reach the end of "F9", as "FA" in its entirety is already assigned.
Also, to Tibi's question from earlier: it looks like that last range used by Fordoniak/adrian10/adik151 is a conflict with a seemingly random range that was in use by SimMars: FC782DA0-FC783188. The other two ranges in "FC" are not listed in the spreadsheet, nor are any ranges assigned to Fordoniak/adrian10/adik151.
And thingfishs, if you're around, it appears you were assigned a range back in November 2009: F6180000-F61FFFFF.
-Alex