Try Variscan for large-scale sliding window analysis of sequence diversity:
VariScan is a software package for the
analysis of DNA sequence polymorphisms
at the whole genome-scale. The
software, i) allows estimating a
number of population genetic
parameters; ii) conducts the analysis
by using the sliding window or a
wavelet transform-based methods to
capture relevant information from DNA
polymorphism data; iii) permits the
visualization of the results by
commonly used genome browsers...All of
analyses implemented in VariScan can
be conducted using the standard
sliding window method that, in turn,
can be used to obtain a graphical
representation of the results (a
detailed description is included in
the appendix).
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what kind of selection analysis are you interested in?