Method of loci
Examples of pseudonumerology:
maths and science mnemonics
The Art of Memory
http://www.likanas.de/ [a German site]
Visual learning techniques
StudyBlue is a free application that allows you to make flash cards and holds them in the cloud for you to access anywhere. it can also be synced with Evernote.
https://www.vtrain.net [flashcard software]
Habitica is a free habit building and productivity app that turns your to-do list into a game. Rewards and punishments motivate you and you can compete with friends and join interest groups who'll help you achieve your goals.
Todoist is an online productivity app, and the basic version, which will satisfy most readers, is free. It aims to help you manage your projects, by forcing you to think about the tasks and subtasks, deadlines and priorities. Then it will help you track them.
FastCo discusses a new app that supposedly will help you 'tame' your email: Mailbox
Those wanting some guidance in apps that help you remember your ‘to-do’ items, might like to check out this New York Times article.
Here’s an information management tool. Now that I’m the proud owner of a Kindle, I was delighted to find a widget (dotEPUB) that enables me to very easily turn a long web article into something I can read on my Kindle. You can also make it so it turns articles to ePub format, which you can read on other devices such as the iPad.
If you’re wondering about getting some digital help with remembering, the New York Times have an article on note-taking apps
TidyLists is a free and simple to-do application for managing your to-do lists.
SpiderScribe is an online brainstorming and mind-mapping tool that lets you organize your ideas by connecting notes, files, calendar events, in free-form maps. You can also collaborate and share those maps online. It's in beta at the moment.
Strike is a game-type app to help people get through their "to-do" lists.
Diigo is particularly for gathering information on the web. It enables you to highlight and annotate pages on the web, share them on multiple devices, share them with other people.
Tests and puzzles