There are so many cool things I want to check out following WordCamp Montreal. Thought I'd compile and share some of them here:

From Kim Vallée & Jérome Paradis's talk about migrating to WP from another platform:

- P2 theme - http://wordpress.org/extend/themes/p2 - also mentioned by Matt Mullenweg, want to check out his post: http://ma.tt/2009/05/how-p2-changed-automattic/
- FlexoArchives widget to collapse archives - http://wordpress.org/extend/plugins/flexo-archives-widget/
- Twitip ID plug-in - add field for Twitter username to comment form - http://wordpress.org/extend/plugins/wp-twitip-id/
- Search Unleashed plug-in - customizable search - http://urbangiraffe.com/plugins/search-unleashed/

From Alexandre Simard's talk about finding a low-cost e-commerce solution:

- eShop e-commerce plug-in - http://wordpress.org/extend/plugins/eshop/
- YAK for WP e-commerce plug-in - http://wordpress.org/extend/plugins/yak-for-wordpress/

From Matt Mullenweg's Q&A session with Jeremy Clarke:

- Ecto & MarsEdit - Mac desktop clients for blogs
- multilingual plug-in they've chosen to work on as "officially supported" (he couldn't remember name, developed by Nicolai?)
- Backpress - puts certain things in its own framework
- BBpress

From WordPress Security talk by Brad Williams:

- WP Security Scan - http://wordpress.org/extend/plugins/wp-security-scan/
- WordPress Exploit Scanner - http://wordpress.org/extend/plugins/exploit-scanner/ (he runs this once a week for his clients)
- WordPress File Monitor - http://wordpress.org/extend/plugins/wordpress-file-monitor/

From Caching & Optimization talk by Jeremy Clarke:

- WP-supercache - http://wordpress.org/extend/plugins/wp-super-cache/
- WP-Tuner - http://wordpress.org/extend/plugins/wptuner/
- Firebug & Yslow (already installed)

From Advanced Theming & Plug-in talk w/Pier-Luc Petitclerc & Jeremy Clarke:

- Widget Logic plug-in - build conditionals into widgets without hard-coding template files - http://wordpress.org/extend/plugins/widget-logic/
- Subversion version control software
- PHPxref code library - http://phpxref.com/