How should large table columns be handled on a responsive design?

Related to This Question, I’m interested in what I should do with a responsive design theme where the users have control over the columns which are displayed in a tabular, data rich page. Users are able to manipulate which columns are disp…
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Are grayscale buttons with icons usable and effective?

The image here is
old gmail
new gmail, when no mail is selected
new gmail, when mail is selected
new delicious
To me, the buttons are unlabeled and tough to discover.
I don’t believe the icons do a good enough job to make labels r…
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Alternative term to "Blacklist" and "Whitelist"

In short, my company is developing a management tool for managing SIM cards. One of the features of the tool is to block the SIM card if it’s put into a none allowed device by device IMEI validation.
The feature for this was mocked up us…
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Alternatives to MDI layout?

As WPF has no built-in MDI support I was looking around for alternatives for a rather large graphical work oriented application. The application will have a lot of different widgets, and for a lot of those the usable area will be different…
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Guidelines for when to auto-save settings vs "save" button

In our web application we have a number of pages to do with user settings, in different categories. For most of them we have a display page with an edit button/link, which takes them to a form which has a cancel/save exit path.
However, …
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Can tags have hierarchy?

Does anyone have experience working with nested tags? I could not find any websites that allow users to have hierarchies in their tags (equivalent to non-mutually exclusive categories). Is it a bad practice in general? If so, why?
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What is User Experience (UX)?

I’ve looked at this site for the first time today. I’ve checked About, the FAQ and the FAQ and searched, and I don’t seem to be able to find an answer on this site.
These are the closest I can find:
https://ux.stackexchange.com/questions/7174/difference-between-ui-and-ux
What’s the difference between UX and layout design?
Reading the first few responses, I’m perceiving quite a difference in scope between ‘user experience’ as a concept and what I see discussed as ‘User Experience’ on this site and elsewhere, and I’m definitely interested in opinions addressing this.
Also, while I appreciate the field is broad, maybe there are some human interactions that definitely aren’t UX – between two of them face-to-face, for example?
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What is the ideal height of a button in regular desktop applications?

On most GUI creator (I just checked Qt Creator and Flex Builder), it seems the default button height is about 22 pixels. This is what I use for most desktop applications I create except those I make for myself. In this case, I use bigger b…
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Selection of multiple items and then selected one as default

I’m trying to design a web interface in which users pick particular “items” and set one of them as default. The textbox for searching uses autocomplete to find the matching item. I’ve come up with the following design to allow the user to …
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What is the difference between wireframing and prototyping?

What is the difference between wireframing and prototyping?
Am I right to think that prototypes should be interactive and wireframes should be static?