How to Remove Attachments from Mail in Mac OS X
Removing attachments from an email or everything in Mail app can be useful for a variety of reasons, from ditching a file that is no longer relevant to an email thread, to lowering the file transfer size when sending/replying to a message, or for more extreme cases for individuals with smaller hard drives, for reducing the overall disk space consumed by the Mail attachments directory.
Whatever the case, use some caution when removing attachments this way, as there is no way to retrieve the mail attachment locally after they have been removed from Mail app. For this reason, if you intend on deleting many attachments from many emails you may want to make a manual backup of the attachment directory beforehand, which we will also cover below by showing you where the attachment files are stored in OS X.
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Got a song, podcast, or another audio track that you want to copy directly to your iPhone, but don’t want to add to your computers general iTunes library? You can skip adding the song to the computer iTunes library completely by using a simple but little known trick, letting you directly transfer music and audio to an iPhone, iPad, or iPod touch. The end result is that you will have music stored only on the iOS device, without having it kept in iTunes as well, completely bypassing the iTunes libraries on a Mac or Windows PC.
LICEcap is a screen recording app that captures a portion of the Mac OS X (or Windows) desktop and saves it directly as an animated GIF. Incredibly simple to use, the apps functionality should be familiar enough to anyone who has used 
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If you’re comfortable with the command line and ever in a situation where you need to find and replace a word, phrase, URL, or character across a group of multiple text documents, perl does the job quite well. A simple command string will very quickly perform a group batch find and replace on text, whether in a single document or spanning a group of multiple documents.
Visiting a new city, or maybe just a part of town you’re unfamiliar with? If you’re concerned you may forget where you parked your car (or bike, mule, horse, chariot, whatever), just pull out your iPhone at that location and use the Maps app to save the location. This simple trick means you’ll never forget where you have parked ever again, even if you’re in a place you have never been before. 
Dashboard is a largely under appreciated feature of Mac OS X that adds little widgets to the Dashboard space or 
PNGcrush is an image optimization utility whose primary function is to reduce the overall file size of the PNG images in a lossless manner. It’s quite popular with developers and designers alike, and though it’s bundled in some versions of linux from the get-go, it’s not included in OS X by default without installing Xcode. We’ll cover four easy ways to get the utility on the Mac, with or without Xcode, and also offer an excellent free GUI alternative which may be more appropriate for many users.
