I think that all of them are meta tags. They are all broadly defined, mean different things to different people and hardly ever used as the sole tag for questions (outside of questions that were shot down anyway).

[source-code] could become meaningful, if it referred specifically to the source code of one program such as for example bitcoind, however, then it should rather be used as [bitcoind-source-code].

[development] could be meaningful if it were used to tag questions that scrutinize the development process of the bitcoin protocol and standard client, however, we already have tags for those. As it is, it is being slapped on any question that deals with development of any bitcoin related software and as such does not narrow down the content of a question by itself without other tags.

Similar things can be said [programming], [protocol], [currencies], [alternates], [api], [client], [services], [software], [statistics], [exchange-rate], [accounts], [logging] ...

I think that all of them are meta tags. They are all broadly defined, mean different things to different people and hardly ever used as the sole tag for questions (outside of questions that were shot down anyway).

[source-code] could become meaningful, if it referred specifically to the source code of one program such as for example bitcoind, however, then it should rather be used as [bitcoind-source-code].

[development] could be meaningful if it were used to tag questions that scrutinize the development process of the bitcoin protocol and standard client, however, we already have tags for those. As it is, it is being slapped on any question that deals with development of any bitcoin related software and as such does not narrow down the content of a question by itself without other tags.

Similar things can be said [programming], [value], [currencies], [alternates], [services], [software], [statistics], [exchange-rate], [accounts], [logging], [monitoring], [graphs] ...