Best Apps?

We just made the switch to iphone 4 (verizon 32G) this week after using BBs for 9 years. So Far so good...

I imagine this is been done, but any suggestions for the best apps that are actually worth getting.

Specifically I am looking for a text short cut app (ex I could type 'sig' and it would put my sig file in). This was a nice feature of the BBs (autotext).

To start, so far my favorites are
(tend to be 'productivity' apps)
Evernote
dropbox
LiveCams
Rmusic (ring tone maker)
Pandora

While I think the new iOS will take care of the autotext feature, TextExpander also does that. You make snippets of letters that will then expand to full paragraphs if you want.

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Yup - in new iOS - works nicely as well - saves many a tap while writing emails or texting. Can even do entire signatures, etc