Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.
Many hosting companies, like mine, won't have the AJAX Extensions installed in the GAC for quite a while, if ever. No worries, you can just put the DLLs in your Bin folder. Since MS hasn't graced us with the DLLs, so you'll have to get them out of your GAC. I haven't found a way to copy DLLs using Windows Explorer, but command-line never fails.
copy "C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\1.0.61025.0__31bf3856ad364e35" C:\dev\MyApp\Bin\copy "C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions.Design\1.0.61025.0__31bf3856ad364e35" C:\dev\MyApp\Bin\
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