Note the Search box on the right hand side (you may need to scroll down a bit).

Simply type in your search term, for example: posters ..

select return and any post containing that search term will be returned.
See also the Index of Posts page and associated sub pages: Digital Tools, Mathematics Light!, and Number. The Top 20 posts of the last week and of all time are updated regularly.
On the right hand side note the categories and tags. For example selecting the Resource Collections category will return posts with many resources for teaching.
The top posts and pages pages are updated regularly, you can view popular recent posts or the most popular posts since this blog began.
There are several companion blogs to this one:
Mathematics for Students addressed to the students has for example a series of Explore pages to direct students to resources for exploring a topic.

Mathematics Calculators and Tools has several online calculators.
Mathematics Games has a collection of favourite games – many from Nrich.
There are many resources for starting and ending lessons described on Mathematics – Starters and Plenaries.
Mathematics Learning and Web 2.0 as featured in TES Resources.