ideas
An ideas page is a page that lists things people want to make, or concepts they are considering. Artem Tyurin is credited with the notion[1][2].
Why
Listing ideas can help organize thoughts but sharing them publicly can add more motivation to implement the ideas or lead to collaboration opportunities.
IndieWeb Examples
Ryan Barrett has an /ideas page since 2002-12-30
Services
aboutideasnow
aboutideasnow.com is a collection of sites that allows looking through people's ideas pages.