I realized I had amassed over a thousand links on my delicious account, thanks in great part to StumbleUpon. Trolling through the list, I realized that there were a number of peculiar tools in that list - single use websites that basically serve one purpose (a very useful purpose at that) and do not do much else. No menus, no registration, very few linked pages and a single purpose is what identifies this list.
Online Conversion Tools
HTML-PDF converter is, as the name suggests, a useful tool to convert web pages to pdf format. Paste the URL, click the "Make PDF" button and wait for the download to appear.
VozMe is a tool that takes some text typed into a text box and creates an text-to-voice mp3 file that can be downloaded for use. Includes options of male or female voices.
Ever had the urge to keep a copy of the funny dog video, only to realize YouTube isn't friendly that way. KeepVid is the solution. Supports YouTube, Metacafe and a ton of other streaming sites.
Media Converter is an online converter of media across a number of formats - both audio and video. In addition it also allows the download of media from a number of online sources.
Zamzar is another great online tool to convert across different formats by uploading an original, or just use an online streaming site and download into a format of choice.
MintEmail is part of the new breed of disposable email tools that allows you to make and use a disposable email id for those annoying websites that need an email from you (you could just use the tools on this list instead). But if you need an email that works for 3 hours only - here you go.
Send Email is a simple anonymous email sender. Need to send a quick note to yourself, but do not trust a public connection - this is the answer for you. You could also choose to annoy a friend, but make sure you check the usage agreement first.
I can't find my phone, is a tool for you if you have misplaced your phone (at home). Type in the number, and the site will give you a ring. Hope you do not have it on silent though.
File Sharing Tools
SendUIt is an easy to use file upload/download service that allows you to share files with anyone. The files size is limited to a 100MB, and you can set the expiration from 30 minutes to a week.
Wikisend is a similar site that allows upload and download of files up to 100MB.
Color Scheme Designer allows you to pick colors for your website. You can choose the kind of color palette you are looking for and the tool helps you pick the individual colors.
Whats its color is a tool that helps pick the primary and secondary color of an image. Extremely useful when you want to build a color scheme around a photograph.
Web 2.0 Badges is a quick and easy way to generate those glossy badges for use on your site or blog.
Favicon.CC is an online icon editor. In addition to importing an image, the site also works as a standalone editor to create a 16x16 icon image.
Here is a clutch of other tools that generate those useful (annoying?) gif files you desperately need. Loading indicator, Stripe creator, Tabs Generator, Reflection Maker, Quick Ribbon, Glossy 2.0 Button Maker.
Roundpic, as the name suggests, takes any picture and rounds the edges to give you a fresh 2.0 look for your photographs.
Image Manipulation Tools
Resizr is a simple tool to re-size and rotate images. There isn't a lot you can do with this tool, but if all you want to do is re-size, this is the tool for you.
Pixenate is an easy to use web-only image manipulation tool. Along with the crop and re-size functions, the tool also allows basic color management and photo enhancement.
Mypictr is a photo extraction tool that allows you to easily pick out your own face from a snapshot to use on your profile.
Pixlr is pushing the boundaries of simple tools. Nevertheless, it is a one page online photo editor that is pretty powerful yet limited to one page.
Other Random Tools
Cost to Drive is a eco-conscious tool that calculates the cost to go from one city to another based on the type of vehicle you are planning to use. If not anything else, it helps prove that a Hummer is three times as expensive as a Prius.
Let me Google that for you. This is for all those people that find it more convenient to bother you with their question rather than google it for themselves. Once you use it you will realize what you have been missing all along.
Namechk allows you to check if a particular name is taken at a large number of social network sites. Useful if you want to use a consistent name across a number of sites.
Finetune, though primarily for the Wii, is a great way to listen to new music based on a type of song or author, without the complexity (Flash usage) of Pandora. I've written about it before.