software rec - Please recommend a tool to draw structs / classes and pointers

Possible Duplicate:
Application to help build diagrams

I know the paper and a pen answer, but I truly need a PC solution.

I made the example below by Word, so please recommend others more suitable and convenient.

By suitable and convenient, I mean I can edit more easily - for example, in Word, if I add something, I have to scale and adjust the whole. In other words, I want something a little bit like SmartArt for focusing on programming illustrations.

Thanks.

Answer

My personal favorites:

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  Altova UModel - Can be complex, but it's not necessary to use every function. (Commercial)

  
  


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  Violet - Simple, but sufficient for most technical software diagrams using UML like elements. Can run via Java Webstart so no installation required. (Free)

  
  

(Edit: Modified Violet link to use official URL which redirects to newer site and version. Also noted Violet's support for webstart).