If you like to use stickies or post-it's on your computer, Wall Wisher is right up your ally. I first heard about this cool/ultra-easy to use site from Larry Ferlazzo's terrific blog.
I can't even put into words (well, I'm going to try) how easy it is to get started. Just click on build a wall, create your entry w/ pic/video/audio if you like, and wahhh-laahhh you have your own page of sticky notes.
While this is great, there are a lot of other options which make it even more appealing. You can choose your own theme, add a logo w/ subtitle, and customize your very own URL. Also, you can get the html code to embed in your site/blog.
While looking into this online application I began to notice that there is no filtering going on whatsoever. However, when you're dealing w/ stickies you really don't want it to be filtered. So, if this is a wall just for "you" you can set it to private and just use it as that... a place where you can upload your notes and then view them whenever you want. Otherwise, you can set it to public and let others view/comment on it.
Wall Wisher is definitely a fun site to use and worth exploring.
Click here for more info.