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I didn't get you on the banana and potato thing Jaclaz. But yes, I do agree that the usefulness of live chat depends on the kinds of services a site provides. Integrating live chat on all sites is definitely not recommended. But since Andrew here has a real estate website, embedding a live chat script is a good option.
My vote goes for html5. Flash slows down the website and my browser keeps getting freezed because of this flash.
Live chat script is a good idea. Embedding it in a website is a bit of a task. I have my own online boutique and had also got the live chat feature built in my website to be able to interact in a better way with my customers. However, since I know nothing about website design, I took professional help from web design company new york in this case.