On Fri, 23 Dec 2005, Uwe Kern submitted an update to the
xcolor 
package.
Location on CTAN: /macros/latex/contrib/xcolor/
Summary description: Driver-independent color extensions for LaTeX and pdfLaTeX
License type: lppl
Announcement text:
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2005/12/21 v2.09
* New features:
    - definecolor and color now accept space-separated color
      specifications, e.g., color[rgb]{1 .5 0};
    - experimental `xcdraw' option extended to `pdftex' and `dvipdfm'
      drivers.
* Changes:
    - test file xcolor2.tex made compatible with recent changes in
      `pstricks';
    - test file xcolor3.tex extended;
    - driver test file xcolor4.tex extended to demonstrate the different
      frame drawing approaches;
    - more efficient implementation of driver-specific code.
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Thanks for the update.
For the CTAN Team
  Rainer Schöpf