I just discovered another very interesting article written by Jennifer Mattern over at RedFly Marketing, Online PR vs. Internet Marketing — here’s an excerpt:

Internet Marketing Tactics:

• Paid advertising (banner ads, text link ads, etc.)
• Link exchanges, free Web directory submissions, blog comments (link-building activities)
• Affiliates
• Sales letters (and other sales copy)
• Article marketing (to drive affiliate sales, traffic, or backlinks)
• Search engine marketing (paid search placements)
• Blogs
• Social bookmarking sites
• Social networks
• Podcasts / Internet radio shows
• Sales, coupons, or other discounts
• E-books
• Reports / white papers
• Direct mail campaigns via email (for promotional purposes)

Online PR Tactics:

• Press releases / news releases
• Op-eds / letters to the editor (for online publications)
• Online newsrooms and media kits
• SEO (to build awareness through organic search engine placements)
• Interviews
• Blogs
• Articles (used to build exposure and expert status more than directly pushing sales or traffic)
• Podcasts / Internet radio shows (if not purely or mostly promotional)
• Reports / white papers
• Email newsletters
• Social networks