We seem to be spending the bulk of the time worrying about player options.
1) As you mentioned, most of the 4E products
published to date have been player focused.
It is easier to work on things for which you
have many examples than few examples.
2) Some of the player work is needed as
background for any conversion work. For
example, the standard races and classes
are the building blocks for NPC opponents
-- and it is also useful to have an idea of
the sorts of abilities that the PCs are
likely to bring to an adventure. For
example, I would not set up a situation
for which short range teleportation is
an easy way out if I know that eladrin
and/or warlocks just might be in the
party.
Anyway -- I think you just volunteered to start
work on an adventure path. Are there ESDs
available for all of the B series modules?
How about for the compilation B1-9 In Search
of Adventure? Taking an inventory of the
available Mystaran Basic level modules
might be a good place to start. Here are
some of the possible adventure paths I can
see using:
B1-9 has three adventure paths, all of which
start in Threshold and end in Specularum in
Karameikos. Since one of the paths takes the
party into Darokin and Alfheim, that path can
be used with a wide variety of other starting
points. All of the adventure paths end with B6
The Veiled Society, from which B10 Night's
Dark Terror leading into X1 The Isle of Dread
seem to be the obvious continuation.
B2 Keep on the Borderlands makes a fine
standalone module that starts in the frontier
fortress of Castellan Keep. I am rather partial
to the idea of starting with this one -- it is
considered one of the classic D&D adventures.
Since it showcases many of the iconic low
level monsters, it should be one of the easiest
to convert.
DDA1 and DDA2 start players out in Thyatis City.
It should not be too difficult to guide the party from
those adventures to The Lost City in B1-9.
Glantri: Kingdom of Magic has an adventure set in
the Great School of Magic. I could see using that
adventure and a few from Gaz 3 before the party
tackles the original B3 Palace of the Silver Princess.
If you have any of the gazetteers, you may want to
peruse them to see if you like their lowest level
adventures as the starting points of adventure
paths. There is plenty of material to convert or
build into an exciting adventure path, so don't
let the fact that nobody has yet gotten very far
with any of them stop you from taking the first
steps.