Pagination: Let the user choose how many items are shown per page?

Does it make sense to let the user chose how many items are shown per page? Or does it make sense under certain circumstances? When? When not?
This is how some big websites handle it:
Google: Used to be in advanced search,…
Pagination: Let the user choose how many items are shown per page?

Does it make sense to let the user chose how many items are shown per page? Or does it make sense under certain circumstances? When? When not?
This is how some big websites handle it:
Google: Used to be in advanced search,…
Solutions for PDF embedding?

Background: We run several websites for classified ads. One of them gets some of the ads from an external source as PDF files. We know PDFs aren’t ideal, but we have to deal with them somehow.
Question: Is there any good way…
tables with lots of columns

I have a table that lists various attributes of an individuals personal development plan; objective, time to complete objective, comments etc. The table is editable so the user can directly add comments without having to go t…
How do you design a registration form?

I am trying to learn about registration forms, what should I be careful about when designing one? Is there any “best practice” or do you know any great websites with great examples of registration forms?
(For example, I like…
Indicating selection in a list with sub-levels not always visible

Suppose we perform a search on an object name and get this results list:
From this list exactly one element can be selected in order to perform an action on that element. An element can be either:
An object itself
OR an …
Why is the close button in the title bar red in Windows 7?

Perhaps to prevent users from closing the window or application inadvertently?
But is it also a distraction because the color of red stands out? Any insights?
Why don’t mobile apps have a ‘close’ button?

I’m a fairly new user of Android and i’m annoyed by the fact that almost all apps lack a “close” button.
Is there any reason why developers don’t make such an option?
Why don’t mobile apps have a ‘close’ button?

I’m a fairly new user of Android and i’m annoyed by the fact that almost all apps lack a “close” button.
Is there any reason why developers don’t make such an option?
Should double click be avoided in web applications?

I find that double click is a great gesture that could be successfully used in graphical interfaces but for some reason has negative connotation on the web. Should it be avoided at all costs?