Intel has four different Atom based D945 based motherboards and just recently they introduced D510MO and D410MO boards.
The first one is based on the dual-core desktop Atom 510 and is a Mini-ITX, DDR2 board. The second one is based on single-core Atom D410 and comes in mini ITX and supports DDR2.
This is not all as Intel plans to launch two new motherboards for DDR3 Atoms. The codename for the one that comes with soldered dual-core Atom DDR3 is Mount Washington and it is a Mini-ITX board.
The second board is codenamed Kinston and is again Mini-ITX DDR3 board with most likely single core DDR3 Atom. These boards are expected in the second half of 2010.