hehe, "I" thought I was the only one worrying about this :)
I use "we", as me + the company entity. And it will require no re-editing if a partner join or you hire.
The company is an entity. It would be appropriate to use "we" more often that not. Use "I" when talking about yourself or yourself on behalf of the entity.
The same should be said for 2 or 3 person teams. Try to get in the habit of thinking about the company as an entity bigger than yourself.
"The market is a lot more discerning than any employer. And it is completely non-discriminatory. On the Internet, nobody knows you're a dog." -- http://www.paulgraham.com/hiring.html
I think if you're alone and selling a non-mission-critical product directly to consumers, using "I" makes you sound more genuine and not out to take advantage of them. If you add a partner you could just do a regex replace.
Depends whatever comes out naturally. When I am responsible for something, say getting back to the customer, use "I"; when I'm giving a statement about iJigg in general for example use "we".
I try to write in the third person as much as possible and avoid using personal pronouns. Although if you're writing a blog post, then I suppose you could use "I" or "we".
I like to use the name of the company in place of "I" or "We" because it reminds the customer who you are. Also, it's good for search engine positioning.
Use "I" because it's more personalized. The excuse for using "we" is simply that the service may seem professional; hence, building more trust. That might actually be true, but unless you're building an online bank, it wouldn't matter.
I initially worked on my webservice alone, and decided to adopt "I" on every possible location. I managed to build a dedicated community around the website, and later on decided to use "we" to denote the community as well as myself. Now, when I say "we thank you for participating", I mean "me and the community...".
Of course, if you've more than one founder (like I do now), you should use "we". Be consistent with the terminology in order to avoid confusing the end-user.
[cletus]"We's all had this here idea to create a series of tubes, and shazzam!...Now you gots tha internet."[/cletus]