I'm pretty new to Foursquare (4Q) etc so maybe it takes a while to
"get" certain things (I've learnt that from Twitter ;) but here is
what I'm currently struggling with:

1) what's good?
I want to know "what's good" in the area I'm in. If I'm looking for a
bar then I'd like to be able to search for one based on the people I
know (or 'n' degrees of people they know) - not just a directory of
bars. I just don't get how foursquare is a discovery service yet.

2) "Me like...me no like"
...and this follows on from above really. How do I indicate whether I
"like" a venue? E.g. if there was a "thumbs up" or "thumbs down"
device then this could capture data which can drive such a "do my
friends like this?" type of query...surely this is worth gold?

3) Twitter
I really think it needs to be more easily accessible via Twitter. I.e.
why not tweet a certain account or use a certain hash tag to check in?
And when Facebook enter the location based arena I may - depending on
my circumstance - "checkin" via a Facebook app - it would all feed
into 4Q (which is essentially a bridge between the networks albeit a
bridge which has the value database of locations!)

Hmm...interesting to see how this pans out!