Hi,
does anyone have a correct set of lip shapes to go with vowels and consonants in irish? I know palatised consonants tend to have spread lips, while velarised phonemes have more rounded lips -generally.

I don't understand your question. What you say is right about the shape of the lips when pronouncing slender and broad consonants.

I remember a post back a while where someone had found a link to some charts showing mouth and tongue positions for different pronunciations. I tried to do a search, but I wasn't able to find it. Does anyone else remember these and could you find them again?

"I don't understand your question. What you say is right about the shape of the lips when pronouncing slender and broad consonants".

What I mean is that, is there a simple linear relationship between phoneme and lip shape, that is, are full velar sounds fully rounded, and fully palatal sounds spread, and other sounds falling somewhere inbetween in a way that one can easily work out?

I can say that at least, bilabial slender sounds are made with spread lips - you can see that when you look at a native speaker who's speaking. Because most of the time, bilabial slender sounds aren't palatalised (as n or t would be), the difference is that you pronounce them with your lips spread, and that they aren't followed by a little "w"-glide as their broad forms are.