Everyone who responded to you pretty much covered it. But, I'll add that integrating your blog with your website is important for a few obvious reasons: (1) kee

Everyone who responded to you pretty much covered it. But, I'll add that integrating your blog with your website is important for a few obvious reasons: (1) keeping your blog on your own website is better user experience; (2) you can more tightly integrate the rest of your website; (3) it's better in terms of SEO (yes, SEO matters); and (4) you have more control over it running on your own servers. By "looking professional" I mean "acting professional". Acting professional is simply a synonym for delivering a quality service, in my opinion. I'm not talking about putting on a facade here. I'm talking about taking everything into consideration, because even the littlest things affect a person's overall experience with your product.