I just wrote a couple of SharePoint posts at the Black Ninja Software blog:

How to Programmatically Impersonate Users in SharePoint
- this post shows how you can programmatically execute code in another user’s context, and you can do this by getting a handle to that user’s UserToken

How to Invoke Javascript Snippets Without Using RegisterClientScriptBlock
- this post shows how to invoke and change Javascript code without needing to register that code. This approach uses asp:Literal

And in case you missed this one:
SharePoint Readiness Checklist – Reposted

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