Hi All,
The simpleslides can not work any more after texlive 2011 upgrading,
 here's the example.tex from slideslides

\usemodule[simpleslides]
          [style=BigNumber]

\setupTitle
  [ title={Title of the presentation},
   author={Name of authors},
     date={Date of presentation},
  ]

\starttext
\placeTitle

\SlideTitle {The first slide}
Write whatever you want.

\SlideTitle {The second slide}
Continue writing.

\stoptext

And the error output is
resolvers       > modules > loaded: 'simpleslides-s-BigNumber'
(/home/joshua/texmf/tex/context/third/simpleslides/simpleslides-s-BigNumber.tex
simpleslides    > loading Big Number style
system          > command \NormalHeight is already defined
system          > command \NormalWidth is already defined
system          > command \PictureFrameHeight is already defined
system          > command \PictureFrameWidth is already defined
))
system          > begin file example.tex at line 10
! Undefined control sequence.

system          > tex > error on line 11 in file example.tex: Undefined
control sequence ...

 1     \usemodule[simpleslides]
 2               [style=BigNumber]
 3
 4     \setupTitle
 5       [ title={Title of the presentation},
 6        author={Name of authors},
 7          date={Date of presentation},
 8       ]
 9
10     \starttext
11 >>  \placeTitle
12
13     \SlideTitle {The first slide}
14     Write whatever you want.
15
16     \SlideTitle {The second slide}
17     Continue writing.
18
19     \stoptext
20


\placeTitle ...\usesimpleslidestitlestyleandcolor
                                                  \c!style \c!color
\simples...
l.11 \placeTitle

?


Test env:
 texlive-2011 + t-simpleslides-2012.02.14.zip

Best regards,
Zhiguang