Selected recent data from collider experiments pertaining to the understand
ing of QCD at low Bjorken-x are reviewed. The status of QCD and Regge facto
rization in hard diffractive interactions is discussed in terms of data fro
m HERA and the Tevatron. The possibility of anomalous behaviour in the yy t
otal cross section is confronted with the most recent measurements from LEP
. Data from all three colliders that are sensitive to possible BFKL effects
are presented and different interpretations are discussed.