select * from master.dbo.sysprocesses with (nolock)
where spid = 61

DBCC TRACEON (3604)
DBCC PAGE (8, 1, 3639600, 0)
DBCC TRACEOFF(3604)
GO

SELECT object_name(99)

DBCC execution completed. If DBCC printed error messages, contact your system administrator.

PAGE: (1:3639600)
-----------------

BUFFER:
-------

BUF @0x016AA340
---------------
bpage = 0x5177A000 bhash = 0x00000000 bpageno = (1:3639600)
bdbid = 8 breferences = 1 bstat = 0x9
bspin = 0 bnext = 0x00000000

PAGE HEADER:
------------

Page @0x5177A000
----------------
m_pageId = (1:3639600) m_headerVersion = 1 m_type = 11
m_typeFlagBits = 0x0 m_level = 0 m_flagBits = 0x0
m_objId = 99 m_indexId = 0 m_prevPage = (0:0)
m_nextPage = (0:0) pminlen = 0 m_slotCnt = 1
m_freeCnt = 2 m_freeData = 8188 m_reservedCnt = 0
m_lsn = (27549:8438:280) m_xactReserved = 0 m_xdesId = (0:0)
m_ghostRecCnt = 0 m_tornBits = 2

Allocation Status
-----------------
GAM (1:3578624) = ALLOCATED
SGAM (1:3578625) = NOT ALLOCATED
PFS (1:3639600) = 0x40 ALLOCATED 0_PCT_FULL DIFF (1:3578630) = CHANGED
ML (1:3578631) = NOT MIN_LOGGED


DBCC execution completed. If DBCC printed error messages, contact your system administrator.
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

GAM (1:3578624) = ALLOCATED
SGAM (1:3578625) = NOT ALLOCATED

Gift Peddie (3/26/2009)

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These are in the physical index architecture check below for details from the owners of the relational engine.

http://blogs.msdn.com/sqlserverstorageengine/archive/2006/07/08/under-the-covers-gam-sgam-and-pfs-pages.aspx

Marios Philippopoulos (3/3/2009)

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I run the following to get the object name:

SELECT object_name(99)

I get the following: ALLOCATION

GilaMonster (3/26/2009)

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It's one of the GAM/SGAM/PFS pages. One of the allocation structures of the database.

This was fairly common to see on tempDB in SQL 2000, not so on user databases. What's the wait time that you're seeing on these waits? If it's a couple milliseconds, don't worry.
Are you doing lots of table creation?