NWBC 3.5 PL13 is now available for download from SAP Service Marketplace: http://service.sap.com/patches
-> Support Packages and Patches -> A - Z Index -> "N" -> NETWEAVER BUSINESS CLIENT -> NWBC NW BUSINESS CLIENT 3.5 -> Win32
PL13 contains more improvements on the Portal connection area. Favorite handling with web dispatcher was also improved.
For more details on all the above, see SAP Note 1559188
