One missing feature of vB5 was that the users who visit a thread don't show up as visiting it.
This small mod display a count of all visitors, members and guests and also the avatars of the visiting members.

Complete Feature List
Lite

• Show the avatars of the current visiting this thread users

Version 1.1(delete the Version 1.0)

• delete a unnecessary and faulty tag. Don't get any info the mod have an error at install
• add some css to work with who read that post and/ or other templates display at the used hook

Version 1.2

• delete a unnecessary and faulty tag. Thought I removed it last time Iam really sorry!

Pro (working on it)

• Widget to place it where you want at all pages
• All CSS editable with Stylevars or vB-default
• Who read the thread counter and list of users
  • Avatar or Username
  • PM/ Chat-button
  • Readdate
• A lot of admincp-settings to display it like you want
• ...
• ... (do that after work, study and sports...so please be patient)

Look here for a demo: vbulletin-forum | Das deutsche Forum für Mods, Widgets und Anleitungen.

Hope you enjoy that small mod.