If sending email you tend to forget about attachments, try the Attachment Alarm for Microsoft Outlook. This email add-in will never let you forget to add an attachment in email if the body of a message contains key words (“see attachment”, etc.).
Attachment Alarm works with Microsoft Outlook 2007, Microsoft Outlook 2003, XP (2002), 2000
Attachment Alarm for Microsoft Outlook is very easy to use and requires no hard tuning. You just specify the words and phrases that may occur in the body of the Microsoft Outlook e-mail message and imply an attachment (“see attachments“, “see attachment“, “in attachment“, “the file attached” etc.) and add these words to the Key words list.