What method do you use to organize/tag your packages so you can then easily retrieve those sharing a same tag? Is there any functionality intended for it?

I've been trying the following ones (ordered by increasing satisfaction): prefixing, flagging, sharing repository, pragma. But i feel like none of these achieves a proper balance (for package tagging) between ease of retrieving, persistence and conceptual coherence/cleanness (at least in the way i've been using them, perhaps i ignore something).

Love,

Laura