Creating my own Admin Forms in a WordPress CMS?

I just decided to try using WordPress for a CMS (not a blog). The site will have some product information that I want the client to be able to update. Instead of creating an entire admin side just for them to update their products, is it possible to create a form in the WordPress admin so they can add products to a database?

Getting a peer review for my new plugin?

What is the best way to get an experienced WordPress developer take a look at my plugin and give constructive criticisms? I have written code to solve some of my questions on this site, and I think they could be useful to others too. However, since they would by my first public WordPress plugins, and I have seen many not-so-great examples in the public WordPress directory, I would like to know “where I stand”, and how I can improve my plugins. I have read the list of best practices, and still need to apply some of them, but I would also like an answer to the more general question “Is this a good way to solve this problem?”