Although all the functionalities of Flickr are used by only a minority of users (basically half of those few owning a Pro account) it can be really useful to make a link between your Flickr pictures and your blog.

1. Flickr in your posts

PhotoDropper: A lightbox-type interface for adding photos to your posts. We have spoken about Zemanta in a previous post, and this free WordPress plugin brings it to another level by browsing all flickr pictures with Creative Commons license and including the keyword you searched for. Pictures are always important for an attractive post and this plugin will help you find the right ones!
With the same aim, WP Decoratr works a bit like Zemanta and will find pictures from flickr relevant to your post content.
Apart from random pictures from flickr you also can choose among yours, or display some of your sets to your readers in a post!

Displaying any of your pictures or other’s in your posts is the most obvious link we can do between Flickr and WordPress. Flickr photo album does it well by adding a simple button on the editor giving you direct access to your flickr sets. Inserting a picture on one of your posts is then really easy!

SimpleFlickr from Josh Gerdes allows you to embed a flickr integrated simpleviewer into your WordPress site.

2. Flickr in your sidebar

Lots of different WordPress plugins were created to have a small thumbnail gallery of your flickr pictures in your sidebar. of course it can be implemented in other places on your blog.

FlickrRSSdisplays photos from different photo-streams according to the settings. You are then able to see the latest pictures that appeared in the RSS feed.
Flickr Thumbnail Photostreamon the contrary displays pictures thanks to the Flickr API.

3. Flickr in a blog gallery

Slickr Gallery is a very fast, bandwidth-friendly photo gallery plugin. You can create galleries with all your sets on separate pages. This plugin will be really useful to people with many Flickr sets.

Flickr tag plugin is another way to have your Flickr pictures to appear in your gallery. It is then your choice where you want to see it appearing on your website, in a post or a page. Thanks to a rich setting page you will be able to customize it easily.

4. Others?

Do you know any other good Flickr WordPress plugins? Do not hesitate to let us know by commenting here!