Question: Which VHDL synthesis tools support the VHDL 2008 fixed and floating 
point types as described at [vhdl.org/fphdl](http://www.vhdl.org/fphdl/)? The
VHDL.org site states "all these packages are designed to be synthesizable in
VHDL-93". Which tools have yield successful results synthesizing the 
VHDL-2008 fixed-point and floating-point types?

Second question, what is the status of VHDL-2008. Has it been ratified?

Answer: 
This doesn't answer your question *exactly*, but ANY working VHDL 93 synthesizer will work with fixed and floating point VHDL libraries under VHDL 93. To get these, see <http://www.eda.org/fphdl/>.
I have used the VHDL fixed-point libraries in Altera's Quartus II (v9.1), with a Cyclone III. They synthesized an IIR filter and an LMS adaptive filter fairly efficiently - I noticed no major difference in resource usage compared to my previous implementation using numeric\_std.

So, I am confident that Quartus supports the fixed-point libraries.