For someone fresh out of college or someone that only has a couple of jobs under their belt, this would not be appropriate. But if you have taken a path that has enabled you to develop a diverse set of skills, you might want to put this smack dab at the beginning of your resume. Similarly, if you are competing for a General Manager or executive-level position, you probably need to show diversity.
When developing a Skills Summary section, be careful about the order you put the skills in and even the ones you choose to list at all. They should match the type of job you want. It’s fine that five years ago you had a job as an HTML programmer and LAN administrator. But if you are going for a marketing management job, you won’t want to overload the Skills Summary section with a bunch of high-tech skills. Since this section is almost always situated at the very beginning of your resume and will be the first thing the reader looks at, some people will decide to read further strictly based on this section.
Finally, don’t mention specific employers or job titles in your Skills Summary section. Skills are areas of talent like business development, sales, M&A or financial. The layout for this section could look something like this: