Hi, I recently released a couple of things to the asset store that I originally created for use with my current game project. Both are fairly simple, but sometimes fancy solutions are overkill.
Simple Tooltips
$2
Web demo: http://www.momentstudio.co.nz/web_demos/tooltips_web_demo/tooltips_web_demo.html
Works with the existing Unity GUI system (so you need to be using the standard GUI). Written in C#. Shows a tooltip next to the mouse pointer when hovering over a GUI item.
Features:
- Text-based tooltips with rich text formatting
- Easily added to anything that takes a GUIContent
- Can be styled as you like
- Easy to customise the delay, distance from mouse pointer etc
- Fade in effect
- Automatically sizes itself to fit the text content

Modal Dialog Boxes
$5
Web demo: http://www.momentstudio.co.nz/web_demos/modal_dialog_web_demo/modal_dialog_web_demo.html
Modal dialog boxes/message boxes. These block interaction behind the dialog so the user has to choose an option before continuing, and unexpected behaviour is less likely. Callbacks let you take action when different options are chosen. You must be using C# for this one.
Features:
- Easily show text-based modal dialog boxes and act on the user’s choice
- Select with the keyboard or mouse
- Up to three buttons with any text
- “Don’t show again” option
- Comes with two complete styles, or specify your own
- Tint the background while the dialog is showing
- Only one modal dialogue script needs to be added to the scene
- Uses the standard Unity GUI system
Does not support:
- Non-text content, e.g. images
- Javascript or Boo
- Multiple dialogs active at once
