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The major differences between the new version 6.06 and the previous version 5.02 of W5051 PDF, the Parton Density Functions package are listed below:
A NEW group of PHOTON structure function sets have been added:
NLL sets of Hagiwara, Tanaka, Watanabe and Izubuchi,
the WHIT group, (WHIT1-G to WHIT6-G).
Several NUCLEON structure function sets have been added:
NLL sets A' and G of Martin, Roberts and Stirling
(MRS-Ap) and (MRS-G) of February 1995 with grid
data as well as in its parametrized version (MRS-Ap-F)
and (MRS-G-Fit);
NLL
parametrisation in the 
as well as in the
DIS renormalisation scheme and as
LO (CTEQ3M, CTEQ3D, CTEQ3L);
NLL in the 
as well as in the DIS
renormalisation scheme and as LO (GRV94-MS,
GRV94-DI, GRV-LO).
Please note that as new default set, the MRS set
(G) has been chosen (NPTYPE=1, NGROUP=3, NSET=41).
For more details see the updated User's Manual.
The response from the Physics community is strongly encouraging us to keep up-to-date with the latest developments in this area. The author will be pleased to learn about new parton density functions, as well as to receive suggestions on how to improve both the usage and the documentation.