  Starting from a (new physics independent) tree level determination of rhobar
and etabar, we perform the Unitarity Triangle analysis in general extensions of
the Standard Model with arbitrary new physics contributions to loop-mediated
processes. Using a simple parameterization, we determine the allowed ranges of
non-standard contributions to |Delta F|=2 processes. Remarkably, the recent
measurements from B factories allow us to determine with good precision the
shape of the Unitarity Triangle even in the presence of new physics, and to
derive stringent constraints on non-standard contributions to |Delta F|=2
processes. Since the present experimental constraints favour models with
Minimal Flavour Violation, we present the determination of the Universal
Unitarity Triangle that can be defined in this class of extensions of the
Standard Model. Finally, we perform a combined fit of the Unitarity Triangle
and of new physics contributions in Minimal Flavour Violation, reaching a
sensitivity to a new physics scale of about 5 TeV. We also extrapolate all
these analyses into a "year 2010" scenario for experimental and theoretical
inputs in the flavour sector. All the results presented in this paper are also
available at the URL http://www.utfit.org, where they are continuously updated.
