Per User Favourite Projects for UI
Have the ability to 'favourite' or 'star' the common projects that you work with in the UI (on a per user basis). These projects would either be the ones shown by default (with all projects available to view if requested), or the favourite projects would be shown first in the UI with others below.

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Tihomir Kit commented
Yes, favourites or bookmarks please. :) We're an outsourcing company and we have lots of clients and projects in octopus and the "Projects" dropdown is slow to navigate when >90% of projects we have in there do not concern you but some other people in the company. Thnx!
EDIT: A Colleague just pointed this out to me - although not really the same thing, but you can go go to dashboard - configure and set the dashboard up to display only certain projects. It will help until you have to jump in with a project you're not on. Would still prefer to have favourites/bookmarks as well.