In the most recent DW news post, DW announced that unfortunately, they will not be able to implement the planned cross site reading list feature.
There is some speculation in the comments about how this happened because LJ has it in for DW, but personally, I feel the real reason is much more mundane and doesn't really have to do with DW in particular or DW's particular usage, but just because the bot DW would be using would be using up more of LJ's resources than is permitted by LJ's rules involving bots. Already LJ has a lot of problems with spam-bots, so perhaps their scrutiny of bots has even increased.
( speculation on the future of DW and LJ )
There is some speculation in the comments about how this happened because LJ has it in for DW, but personally, I feel the real reason is much more mundane and doesn't really have to do with DW in particular or DW's particular usage, but just because the bot DW would be using would be using up more of LJ's resources than is permitted by LJ's rules involving bots. Already LJ has a lot of problems with spam-bots, so perhaps their scrutiny of bots has even increased.
( speculation on the future of DW and LJ )