Vowel-enriched

queuing -- with five vowels in a row.

offered by Jonathan Phillips (jonthegeologist@hotmail.com):

Palaeoaeolian (UK spelling, 6 consecutive vowels). Word used to describeancient wind created rock deposits.

Also

Words with long clusters of vowels:

$ grep "[aeiou]\{4\}" $t

1  aqueous (adj)
1  diaion (n)
2  giaour (n)
0  miaou (n,v) =meow
3  obsequious (adj)
0  obsequiously (adv)
5  obsequiousness (n)
2  onomatopoeia (n)
1  pharmacopoeia (n)
1  prosopopoeia (n)
1  queue (n,v)
0  sequoia (n)
1  subaqueous (adj)
2  terraqueous (adj)
1  zoogloeoid (n)

Words with lots of vowels but only a few consonants:

Found with commands such as:
grep -i "^\([aeiouy]*[^aeiouy]\)\{3\}[aeiouy]*$" $w|grep .........

adieu
aerie
bayou
eerie
eyrie
gooey
hooey
miaou
payee
queue
yahoo
acequia
anaemia
aqueous
aureate
aureola
aureole
evacuee
eyepiece
eyesore
nouveau
pyaemia
rouleau
sequoia
aetiology
amoebaeic
amoebaeum
audacious
audiotape
auxiliary
beauteous
equipoise
eukaryote
ideologue
leukaemia
niaiserie
  also
Louisiana
Ouagadougou
audaciously
autonomasia
audiovisual
bourgeoisie
eidouranion
onomatopoeia
unbeauteous

we might also add on

Hawaiian and Sequoia should we allow proper names.

There are also the following if we allow 'y' as a vowel:

2 bayou (n)
4 buoyancy (n)
6  buoyant (adj)
0  buoyantly (adv)
0  buyout (n)
0  employee (n)
1  gooey (adj)
0  hooey (n)
0  joyous (adj)
0  joyously (adv)
0 23177 payee (n)
0 23184 payout (n)
0 34934 voyeur (n)
0 34935 voyeuristic (adj)

There is also the nasty list here, which contains words found in a rather lengthy word list, which unfortunately, seems to contain a number of words that are not in "the dictionary."