Sometimes it'll be an improvement, sometimes it might make the text rendering worse, sometimes it'll make no difference. But there's a certain amount of randomness to this.
Note also how aligning the text object to the pixel grid does make a small difference when hinting is off (e.g. (I can't find anything spelling out exactly what each anti-aliasing method does - it looks like 'Crisp' and 'Strong' may actually be turning Illustrator's hinting off, or at least, dampening it down) You can see the ugly distortion, lowering flat-topped letters and raising round-topped letters, appearing when hinting is on and when anti-aliasing is 'Sharp', regardless of whether the object itself is aligned to the pixel grid - because the hinting (adjusting details to fit the pixel grid) is happening at the level of each detail of each character, not the text object itself. Without hinting (i.e.'Art optimised' save for web, or less than CS4 save for web ): onscreen preview, or, in CS5+, save for web with "Type Optimised" selected) In Illustrator CS5+ there are options for how type is anti-aliased similar to those in Photoshop, so we can compare the combinations (top rows are 10 Helvetica Neue Light, bottom rows 14pt), of which CS4 appears to only use 'Sharp': This particular case, however, is a combination of the particular type of anti-aliasing and hinting. Double check that the text isn't very slightly rotated, as this will make the hinting go nuts.You can pixel-align individual objects without other consequences with the Pixel Align script (download) from Wundes. More recent versions of Illustrator have an 'Align to pixel grid' option, but it affects everything and has consequences like preventing stroke widths of less than 1pt. First, two common causes of wonky, misaligned, disjointed text where characters don't line up or size correctly relative to each other that are not the causes in this specific case:
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