just links

avat&ars links

http://wordpress.stackexchange.com/questions/120060/frontend-image-upload?rq=1
http://wordpress.stackexchange.com/questions/19064/frontend-image-uploading-from-edit-profile-page-goldenapples?rq=1
http://wordpress.stackexchange.com/questions/24902/frontend-simple-local-avatar-upload?rq=1
http://wordpress.stackexchange.com/questions/54044/wordpress-user-profile-upload-if-page-is-saved-file-reset?rq=1
http://wordpress.stackexchange.com/questions/25635/uploading-avatar-from-the-frontend?rq=1
http://wordpress.org/support/topic/plugin-simple-local-avatars-using-this-plugin-in-a-front-end-page
http://www.trottyzone.com/integrating-profile-builder-simple-local-avatars-with-php-code-for-post/
http://www.wordpress-fr.net/support/viewtopic.php?id=80521
http://wordpress.org/support/topic/front-side-support
http://www.trottyzone.com/upload-a-photo-via-front-end/

have look 
https://github.com/mach7/embroideryadvertisers/blob/155f357f93307bc638fd1b769897898080cd157c/wp-content/themes/embroideryadvertisers/profile.php
very useful
https://github.com/arpita-jain/sai/blob/d75cffb1f4604d7f8ca15eca7d5ffd40d788576f/arben_11nov_bk/wp-content/plugins/join-network/template/home_owner.php

https://github.com/arpita-jain/sai/tree/d75cffb1f4604d7f8ca15eca7d5ffd40d788576f/alex_project_backup2



http://html5demo.braincracking.org/demo/fileAPI.php
http://hayageek.com/jquery-ajax-form-submit/
http://wordpress.stackexchange.com/questions/100287/specified-file-failed-upload-test-error-when-uploading-image-from-front-end
http://pastebin.com/fk4i54cw
http://wordpress.stackexchange.com/questions/100978/wordpress-front-end-media-image-upload-error
http://wordpress.stackexchange.com/questions/82741/upload-an-image-at-frontend-create-direction-and-or-rename-filename-possible

http://pastebin.com/T8PQjBH5
http://pastebin.com/tygy7E9s
http://pastebin.com/S1mVdQgc
http://pastebin.com/pMKmzjk6

http://pastebin.com/TQwHQV7z
http://pastebin.com/XfGUuy0P